A boat whose speed is 15 k/hr in still water goes 30 km downwards and come back in total 4 hr 30 min what is the speed of stream in km/hr
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let the speed of stream be x km/hr
total.time = time downwards + time upwards
total time = 30/(15+x) + 30/(15-x)
4.5 hr = 30(15+x +15 - x)/(225- x^2)
solving for x we get
x is 5km/hr
total.time = time downwards + time upwards
total time = 30/(15+x) + 30/(15-x)
4.5 hr = 30(15+x +15 - x)/(225- x^2)
solving for x we get
x is 5km/hr
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