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The speed of a motor-boat is that of the current of water as 36 : 5 The boat goes along with the current in 5 hours 10 minutes. It will come back in ?
5 hrs 50 min
6 hrs 50 min
12 hrs 10 min
Since the ratio is given 36 : 5
Let the speed of boat in still water = 36 km/h.
and the speed of the stream = 5 km/h
Downstream speed = 41 km/h
Upstream speed = 31 km/h
Distance = Downstream speed ×
Downstream time = (41 × 31/6) km.
Upstream time = Distance/ Upstream = [41 × (31/6)]/31 = (41 × 31)/6 × 3
= 41/6 = 6 hrs. 50 min.
By: Manpreet kaur ProfileResourcesReport error
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