The speed of a boat in still water is 15km/h and the speed of a stream is 5km/h.Find the time taken by the boat to cover 40km upstream and 36 km downstream
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Answer:
Speed of man (x) = 60 km/hr and speed of downstream = 75 km/hr. ∴ Speed of stream = 15 km/hr. Hence upstream speed = 60 – 15 = 45 km/hr. So time taken to cover 20 km = 20/45*60 = 26.67min.\
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Answer:
time=distance/speed
=40/15
=2.66 km per hour
second boat=36/5
=7.2KM PER HOUR
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