Kirti can row a certain distance downstream in 24 hours and can come back covering the same distance in 36 hours. If the stream flows at a rate of 12 kmph, find the speed of Kirti in still water.

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Kirti can row a certain distance downstream in 24 hours and can come back covering the same distance in 36 hours. If the stream flows at a rate of 12 kmph, find the speed of Kirti in still water.

A30 kmph

B40 kmph

C15 kmph

D60 kmph

Answer:

D. 60 kmph

Read Explanation:

Let the speed of Kriti in still water be x Kriti’s speed downstream = x + 12 Kriti’s speed upstream = x – 12 According to the question, ⇒ 24(x + 12) = 36(x - 12) ⇒ 2x + 24 = 3x – 36 ⇒ X = 36 + 24 ⇒ X = 60 kmph

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