Question

A man can row 7(1/2) km  downstream and 5 km upstream in 1 hour. He can row 22(1/2)  km downstream and 20 km upstream in 3(1/2)  hours. He will row a distance of 18(3/4)  km in still water in:

A 1 hour
B 1(1/4) hours
C 1(1/2) hours
D 1(3/4) hours
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