The speed of a boat in still water is 60 km/hr, while the speed of stream is 25 km/hr. The boat crosses the stream and lands on the opposite bank at a distance of 195 km from starting point. Find the width of the stream (in km).
Solution
Correct Answer: Option D
Let the width of stream be T km.
Due to its engine power, boat will cross the stream. And due to speed of stream, boat will travel along the stream.
However, time taken in both the processes will be same.
Width of stream is T km and due to the flow of stream, the boat reaches at a distance of 195 km on the opposite bank from the point opposite to its starting point.
We know, Time taken = Distance / Speed
⇒ T/60 = 195/25
⇒ T = 60 × 7.8 = 468
∴ Width of stream is 468 km
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