There is a boat with speed 17 km/hr. The stream has a speed of x km/hr. What are the upstream and downstream speeds respectively?

17-x, 17+x

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17 + 2x, 17 - 2x

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17-(1/x), 17+(1/x)

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17+(1/x), 17-(1/x)

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Solution

The correct option is A
17-x, 17+x

When a boat floats along the stream (downstream), the stream and the boat's speed add up because stream helps the boat to move faster.

Hence, downstream speed = 17 + x km/hr

When the boat goes against the stream (upstream), the stream slows the boat down. Hence, the stream reduces boat’s speed.

Hence, upstream speed = 17 - x km/hr

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