Question

The boat's speed in calm water is 30km/h.A boat takes same time to travel 10km upstream as it does to travel 15km downstream. Find the speed of the river current​

Answer 1

Step-by-step explanation:

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solution : let the speed of current be x

upstream : x-y= x-30

downstream: x+y= x+30

t1+t2= d/s+ d/s

but time is same as given in question

10/x-30 = 15/x+30

10x+300= 15x-450

5x-150=0

x=150/5

x=30km per hour