. One student takes 20 mins to reach school if he goes at a speed of 15kmph .At what speed should
he go to
reach in 15 min

• Speed=15kmph
  time taken=20m or 1/3hr
  Distance=15/3=5km
  To cover 5 km in 15 minutes(or 1/4hr), it takes 20 kmph(5*4/1)
• 12 years agoHelpfull: Yes(20) No(3)
• 1) time =20mins,speed=15kmph=15*(5/18)=25/6 m/sec
  distance=20*(25/6)=250/3 m
  then 2) given as time =15min
  speed=250/3*15=(50/9)*(18/5)kmph=20kmph
  
• 12 years agoHelpfull: Yes(13) No(3)
• distance = speed * time.
  in this case distance is constant.
  so, final speed*15=15*20
  then final speed =20kmph
• 9 years agoHelpfull: Yes(2) No(0)
• distance=>
  20*15= 15*x
  x= (20*15)/15
  x=20kmph
• 7 years agoHelpfull: Yes(1) No(0)
• let, distance= x
  x/(20*60) m/sec= 15*5/18 m/sec
  x= 15*5*20*60/18, x=5000m
• 9 years agoHelpfull: Yes(0) No(8)
• case1:
  distance = speed x time= 15 x 20/60 =5km
  case2:
  speed= distance/time = 5/(15/60) 20kmph
• 7 years agoHelpfull: Yes(0) No(0)
• Distance = Speed * Time ,
  Distance same
  Case I
  Speed (s1) = 15 and Time (t1) = 20
  case II
  Speed = s2 and Time(t2) = 15
  
  so s1 * t1 = s2 * t2
  15 * 20 = s2 * 15
  s2 = 20 kmph
  
• 7 years agoHelpfull: Yes(0) No(0)