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
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Hello hope u will understand it easy as it is an important question according to board support plz
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
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