Sailor Raju covered a distance of 8 km. in 1 hr. and 40 minutes down stream and return to the starting point. If the speed of the stream is 2 km/hr, find the speed of the boat is still water.

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Solution

Let the speed of the boat in still water be v km/h.

Speed of the boat while going downstream = (v + 2) km/h

Speed of the boat while going upstream = (v – 2) km/h

The time taken to cover the distance of (8 + 8) km is

Splitting the middle term, we get:

Hence, the speed of boat in still water is.

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Sailor Raju covered a distance of 8 km. in 1 hr. and 40 minutes down stream and return to the starting point. If the speed of the stream is 2 km/hr, find the speed of the boat is still water.

Let the speed of the boat in still water be v km/h. Speed of the boat while going downstream = (v + 2) km/h Speed of the boat while going upstream = (v – 2) km/h The time taken to cover the distance of (8 + 8) km is Splitting the middle term, we get: Hence, the speed of boat in still water is.