Suraj can row 63 km from point A and return to it in 15 hours. The time taken by Suraj to row 21 km downstream and 12 km upstream is equal. Find the speed of the flow?

1
90/40 kmph
2
91/40 kmph
3
89/40 kmph
4
69/40 kmph
5
99/40 kmph

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