The downstream speed of a boat is 17 km/hr and the speed of current is 2 km/hr. What is the total time (in hours) tak- en by the boat to cover 65 km upstream and 170 km down- stream?
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Step-by-step explanation:
downstream speed =17km/hr
still water speed of boat = downstream speed - speed of current = (17-2)kmph = 15kmph
upstream speed = 15-2(speed of current) =13kmph
total time = downstream time + upstream time
(time= distance/ speed)
downstream distance/downstream speed + ulstream distance/ upstream speed
= (170/17) + (65/13) = 15 hours
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