Question

Water in Ganga flows at 2km/h. A boat upstream for 5 h, and then returns to its original position in 3h downstream. Find the speed of the boat in still water.​

Answer 1

Step-by-step explanation:

Current speed of water =2km/h

travels Upstream for 5h

travels Downstream for 3h

Upstream:Downstream=5:3

Sum of the ratio =5+3=8

5/8 of 2 km/h=5/4km/h

3/8 of 2 km/h = 3/4km/h

Upstream=(2-5/4)km/h=(8-5/4)km/h=3/4km/h

Downstream =(2+3/4)km/h=(8+3/4)km/h=11/4km/h

=>Speed of the boat= (11/4+3/4)km/h=14/4km/h=7/2km/h.

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