Question : The effective speed of a boat is 15.2 km/h against the stream and 20.8 km/h along the stream. Find the speed of the stream.
Option 1: 18 km/h
Option 2: 1.8 km/h
Option 3: 2.8 km/h
Option 4: 4.3 km/h
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Correct Answer: 2.8 km/h
Solution : Speed of stream $= \frac{\text{Speed along the stream - Speed against the stream}}{2}$ $ = \frac{20.8 - 15.2}{2}$ $ = \frac{5.6}{2}$ $ = 2.8$ km/h Hence, the correct answer is 2.8 km/h.
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Question : A man rows to a place 48 km distance and comes back in 14 hours. He finds that he can row 4 km with the stream at the same time as 3 km against the stream. The speed of the stream is:
Question : A boat covers 35 km downstream in 2 h and covers the same distance upstream in 7 h. Find the speed (in km/h) of the boat in still water.
Question : The speeds of a boat along and against the current are 14 km/hr and 8 km/hr, respectively. The speed of the current is:
Question : A boat goes 20 km upstream and 44 km downstream in 8 hours. In 5 hours, it goes 15 km upstream and 22 km downstream. Determine the speed of the boat in still water.
Question : Direction: A boat can travel at a speed of 30 km/hr in still water. If the speed of the stream is 6 km/hr. Find the time taken by the boat to go 108 km downstream.
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