Will someone please explain this to me?

A motorboat takes 5 hours to travel 100km going upstream. The return trip takes 2 hours going downstream. What is the rate of the boat in still water and what is the rate of the current?

Question

Will someone please explain this to me?


A motorboat takes 5 hours to travel 100km going upstream. The return trip takes 2 hours going downstream. What is the rate of the boat in still water and what is the rate of the current?

inowalst · Answer

@Compassionate

ganpat · Answer

Let the speed Upstream be a kmph and in downstream be  b kmph, 
a = 100/5  and b = 100/2

Speed in Still water  = (a + b)/2
Rate of stream = (a - b)/2

anonymous · Answer

So speed in water would be 35 and rate of stream would be 15?

ganpat · Answer

according to the formula.. Yes !

anonymous · Answer

Thank you so much!

ganpat · Answer

Sure ! :)