Question

Speed of the stream is 15 kmph and speed of the boat downstream in 45 kmph. Find the ratio of upstream speed and downstream speed of a boat.

• A. 1 : 3
• B. 1 : 5
• C. 2 : 1
• D. 3 : 5

Answer 1

Answer:

A. 1 : 3

Speed of the stream, B = 15 kmph Speed of the downstream = A + B = 45 kmph Speed of the boat in still water, A = 45 – 15 = 30 kmph Speed upstream = A - B = 30 – 15 = 15 kmph ∴ Required ratio = 15 : 45 = 1 : 3