Question

Two friends hire a boat for 3 hours. The river
flows at a speed of 5 km / h and the boat
moves with speed of 15 km/h relative to the
water. How far along the flow direction, they
can go if they have to return in 3 hours (in
km)

Answer 1

Answer:

given relative speed of boat = 15km/hr

speed of river = 5km/hr

therefore, speed of boat = 15+5 = 20km/hr

total speed of boat = 25km/hr ( as the boat and the river are moving in the same direction and the boat is riding on the river , with perspective to one standing on land , he will see the boat move at a speed of 5+20km/hr.)

total time = 3hr

distance covered = 3 × 25 = 75km

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