train start from mumbai to delhi at 12.00am with speed of 60km/hr another train starts from delhi to mumbai at 1.30 with speed of 80km/hr find time when they meet.

• 1 train 12.00 = 60km ; 2 train 1.30 = 80km;
  1 train travel till 1.30 = 90 km.
  1 2
  150 80 -2.30
  210 160 3.30
  270 240 4.30
  330 320 5.30
  360 360 6.00
  so they meat at 6am
• 10 years agoHelpfull: Yes(42) No(15)
• let he two trains meet x hours after 1:30
  then distance traveled by 1st train in 3/2+x hours = distance traveled by 2nd train in x hours
  60 * (3/2+x) = 80*x
  by solving we get x=4.5
  imples 4.5 hours after 1:30
  = 6:00 am
• 10 years agoHelpfull: Yes(26) No(8)
• why distance is not require dude..if distance is less then 200km then your answer will change ...try to think about logic,,,you can not think about distance by your self
• 10 years agoHelpfull: Yes(25) No(4)
• you can not calculate time if distance is not given between two station..it was dummy question ..
  
  
  
• 10 years agoHelpfull: Yes(18) No(10)
• t1 at 60km/hr covers 60 km in 1 hr
  t2 at 80 km/hr covers 80 km in 1 hr
  since t2 starts at 1:30 t1 has covered 90 km in between 12:00 to 1:30
  so now the relative speed when t1 and t2 both in moti0n is 80-60=20km/hr(opposite travel)
  so 20 km in 1 hr
  then 90 km in 4.5 hr
  1:30+4.5=6am
• 10 years agoHelpfull: Yes(10) No(7)
• question is not complete..
• 10 years agoHelpfull: Yes(4) No(4)
• how u guys equate the same distance travelled by two train!!!!!!!!!!!!
• 10 years agoHelpfull: Yes(4) No(0)
• speed 60km=distance /time
  speed 80km=distance/time
  equating 1 and 2
  60*(t+1)=80*(t) because 2nd train starts after 1.5 hour
  by solving we get t=4.5
  so after 4.5 hours they meet (ie) at 6am they meet
  
  
• 10 years agoHelpfull: Yes(3) No(7)
• it is a dummy question!!! bcoz here distance between cities is not given..
• 10 years agoHelpfull: Yes(3) No(1)
• If the train start from mumbai meet the train after t hour,then train starting from delhi will meet it after (t-3/2)time.
  so we can write 60*t=80*(t-3/2)
  therefore t=6
  The ans is 6 am
• 10 years agoHelpfull: Yes(3) No(1)
• Its dummy question...we can not equate them on the basis of distance because they can travel same distance at x hour of time....
• 10 years agoHelpfull: Yes(2) No(0)
• there is a simple trick: u*t/(v-u) where.. 'u' is the speed of first train and 'v' is speed of second train and 't' is time after which the second train left. in this case u=60, v=80 and t=3/2 hours (because 12 to 1.30 we have difference of 1.30 i.e 1+(30/60)=3/2hrs.
• 10 years agoHelpfull: Yes(2) No(2)
• tarin M_D start 12.00 am so
  1 hrs-60km
  2hrs - 120km
  3 " - 180km
  4 " - 240km
  5 " - 300km
  6 " - 360km
  now train D_M start 1:30
  so ,
  2:30 - 80km
  3:30 - 160km
  4:30 - 240km
  5:30 - 320km
  6:00 - 360km
  
  so they meet at 6:00 pm
• 10 years agoHelpfull: Yes(1) No(1)
• either distance should be given or both the train should be started from the same city....
• 10 years agoHelpfull: Yes(1) No(0)
• hey chanchal here distance if not required the distance is constant so we equating the distance
• 10 years agoHelpfull: Yes(0) No(3)
• madhuri please explain,why you calculated for 90km distance...and thn added,i got ur concept..some confusion please give me theoratical explanation
• 10 years agoHelpfull: Yes(0) No(0)
• relative speed=80-60=20
  d=90km(distance travelled by 1st train between12:00 to 1:30)
  t=90/20=4.5 or 4:30
  time of meeting=1:30+4:30=6:00
• 10 years agoHelpfull: Yes(0) No(1)
• 1:30 what am or pm
• 10 years agoHelpfull: Yes(0) No(0)
• distance between delhi and Mumbai is 1384 km by train,,,!!!
• 10 years agoHelpfull: Yes(0) No(0)
• for ur kind information...distance between delhi and Mumbai is 1384 km by train,,,!!!
  
• 10 years agoHelpfull: Yes(0) No(0)
• please upload full question.........
• 10 years agoHelpfull: Yes(0) No(0)
• Ratio of their speeds=80:60, since speed and time have inverse relation,
  Ratio of their time=60:80 =3:4
  So, extra time that train from Mumbai has will be covered by the train from Delhi in T-3T/4 = T/4 time.
  T/4 = Extra time of 3/2 hours
  Therefore,
  T = (3/2)* 4 = 6 hours
  
  Thus, meeting time is 6 hours later from 12pm, that is 6pm.
  
  This T/4 =
  
• 9 years agoHelpfull: Yes(0) No(0)