Question

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.

• A. 30 kmph
• B. 40 kmph
• C. 15 kmph
• D. 60 kmph

Answer 1

Answer:

D. 60 kmph

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