The speed of a boat in still water is 8 kmph. If it can travel 1 km upstream in 1 hr, What time it would take to travel the same distance downstream?

A. 1 minute

B. 2 minutes

C. 3 minutes

D. 4 minutes

• 53% of 42 machines is 53*42/100=22.26 and
  48% of 58 machines is 48*58/100=27.84,
  so
  22.26+27.84 =50.1..
• 9 years agoHelpfull: Yes(22) No(6)
• Speed in Still Water=8 km/hr
  Distance travelled in upstream=1 km in 1 hr Therefore speed in upstream =1km/hr
  Now, Speed in still water=Speed(upstream)+Speed(Downstream)/2
  That is 8=1+ Speed(downstream)/2
  So speed in downstream=15km/hr
  Now , time taken in downstream= distance/speed=>> 1km/15km/hr=1/15
  Converting time in min.=>> 1/15*60 = 4min answer
• 8 years agoHelpfull: Yes(12) No(0)
• D. ans 4 min
  still water=(downstream + upstream)/2
  8=(downstream+1)/2
  downstream=15 kmph
  1 km distance taken by 4 min
• 8 years agoHelpfull: Yes(4) No(0)
• Using alligations, 53-42=11. And 48-11=37. therefore 42+37=79%
• 9 years agoHelpfull: Yes(1) No(8)
• if collecting % of 1st building then, 53+42=95%
  n 2nd building is 48%
  so, percentage= 48*100/95=50.5%
  
• 9 years agoHelpfull: Yes(0) No(9)
• ans is 4 mins
• 5 years agoHelpfull: Yes(0) No(0)
• 4 mint...
• 5 years agoHelpfull: Yes(0) No(0)