Question

A boat travels 24 km upstream in 6 hours and 20 km downstream in 4 hours Then the speed of boat in still water and the speed of current water are respectively:

• A. 4 kmph and 3 kmph
• B. 4.5 kmph and 0.5 kmph
• C. 4 kmph and 2 kmph
• D. 5 kmph and 2 kmph

Answer 1

Answer:

B. 4.5 kmph and 0.5 kmph

Let the speed of boat in still water = X kmph Speed of water = Y kmph Relative speed of boat in upstream = X – Y = 24/6 = 4 kmph …… (1) Relative speed of boat in downstream = X+ Y = 20/4 = 5 kmph …… (2) After solving these two equations : X = 4.5 kmph and Y = 0.5 kmph