given below

Asked by PRAMOD | 1st Dec, 2013, 01:57: PM

Expert Answer:

Let x be the speed of the boat in still water.
 
Then the speed of the boat in upstream is x - 2 km/h and the speed of the boat in downstrem is x + 2 km/h.
 
Distance covered in upstream is 30 km.
 
Therefore, the time taken to cover a distance of 30 km upstream is
And the time taken to cover a distance of 30 km downstream is
 
Given that the time taken by the motor boat in upstream exceeds the time taken by the boat in down stream by 2 hours.
 
Therefore, we have

Answered by Vimala Ramamurthy | 1st Dec, 2013, 03:30: PM

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