One man travels 10 km upstream n 5 hrs another man travels downstream 10 km in 3 hrs. If the speed of the stream is 0.5 km/hr, what is the difference between the speeds of men?
A. 5/4
B. 7/3
C. 4/3
D. 2/3
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Speed of the stream = 0.5 kmph.
Speed of the first man upstream = 10/5 = 2 kmph.
Speed of the second man downstream = 10/3 = 3.33 kmph.
So, actual speed of the first man = 2 + 0.5 = 2.5 kmph.
Actual speed of the second man = 3.33 - 0.5 = 2.83 kmph.
Difference in the speed in still water = 2.83 - 2.5 = 0.33 kmph.
And just difference in speed = 3.33 - 2.5 = 1.33 kmph.