1.

3. A motorboat goes downstream and covers the distance between two ports in 5 hours andreturns back in 7 hours. If the water is flowing at 2 km/h, find the speed of the boat instill water.

Answer»

Speed of stream = 3 km/hrlet speed of boat = x km/hr

now speed of guy while traveling upstream = x-3 km/hrand while going downstream = x +3 km/hr A/Q dis/x+3 = 5 ⇒ dis = 5(x+3) .......(1)similarly dis/x-3 = 6 ⇒ dis = 6(x-3) ........(2)

⇒ 5x + 15 = 6x -18 ⇒ x = 33 km/hr



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