A diver rowing at the speed of 3 km/h in still water takes double the time going 50 km upstream compared to going 50 km downstream. The speed of the diver downstream is:
4 km/h
The correct answer is Option 3 i.e. 4 km/h.
Let the speed of the stream be x km/h
Downstream speed = 3 + x
Upstream speed = 3 - x
Time taken upstream is double the time taken downstream
⇒ 50/(3 - x) = 2 × 50/(3 + x)
⇒ 1/(3 - x) = 2 × 1/(3 + x)
⇒ (3 + x) = 2(3 - x)
⇒ 3 + x = 6 - 2x
⇒ 3x = 3
⇒ x = 1
Downstream speed = 3 + x = 3 + 1 = 4 km/hr
Similar Questions
Adriver rowing at the speed of 3 km/hr in still water takes double the time going 50 km upstream compared to going 50 km downstream. The speed of the diver against the stream is:
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Important Questions from Boat and River
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