A boat takes 2hours to travel 8km and back in still water lake. With water velocity of 4kmph, the time taken for going upstream of 8km and coming back is
Asked by valavanvino1011
13th August 2018,
8:57 PM
Answered by Expert
Answer:
Speed of boat in still water = 16/2 = 8 km/hr.
water velocity = 4 km/hr
velocity in upstream direction = 8-4 = 4 km/hr
time for travelling 8 km upstream = 8/4 = 2 hr
velocity in downstream direction = 8+4 = 12 km/hr
time for travelling 8 km downstream = 8/(8+4) = (2/3) hr = 40 min.
total tme of travelling = 2 hr 40 minutes
Answered by Expert
14th August 2018,
1:57 PM
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