Question

The speed of boat downstream and upstream is 30 km/hr and 20 km/hr respectively. Time taken to travel a distance of (a + 50) km downstream and (b + 25) km upstream is 12 hours, and time taken to travel (a + 90) km upstream and (b + 70) km downstream is 18 hours. Find the difference between the value of a and value of
b.

A 25
B 30
C 20
D 15
E None of these
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