Quantitative Aptitude Speed Time and Distance Boat and River

A boat takes 21 minutes to go 12.6 km upstream. The ratio of the speed of the boat in still water to that of the stream is 7 : 2. How much total time (in hours) will the boat take to go 43.2 km upstream and 38.88 km downstream?

1

1.6

2

2

3

1.8

4

2.4

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