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A motorboat whose speed is 20 km/h in still water takes 30 minutes more to go 24 km upstream than to cover the same distance downstream. If the speed of the boat in still water is increased by 2 km/h, then bow much time will it take to go 39 km downstream and 30 km upstream?

[SSC CGL 11th April 2022 Shift-1 With Answers]
A
B
C
D

EXPLANATION

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