A rower can row a boat 56 km/h in downstream. speed of current is 40% of speed of boat in still water what is time required for him to cover a distance of 40 km in upstream?
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Let the speed of boat in still water be x.
The speed of the stream is :
0.4x
Speed upstream = speed of the boat in still water less the speed of the stream.
Speed down stream = speed of boat in still water plus speed of the stream
Speed downstream = x + 0.4x = 1.4x
This equals to 56
56 = 1.4x
x = 56/1.4
x = 40 km/h - the speed of boat in still water.
Speed of the stream is : 0.4 × 40 = 16km/h
Speed upstream = 40 - 16 = 24km/h
Distance = 40km
Time = Distance / time
Time = 40/24 = 1 hr 40 minutes
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