A boat can cover 60 km downstream in three hours. If the boat covers 48 km still water in 3 hours, then find the time taken (in hours) by the boat to cover 72 km upstream?
Given:
Time taken by boat to cover 60 km downstream = 3 hours
Time taken by to cover 48 km in still water = 3 hours
Formula Used:
Upstream speed = speed of boat - speed of stream
Downstream speed = speed of boat + speed of stream
Distance = speed x time
Explanation
Downstream speed of the boat = 60/3= 20 km/hr
Still water speed of the boat = 48/3= 16 km/hr
Speed of stream = 20 – 16 = 4 km/hr
Required time = 72/(16-4) = 6 hours
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