The speed of the boat in still water is 5 times the speed of the current. It takes 1.1 hours to row to point B from point A downstream. The distance between point A and point B is 13.2 km. How much distance will it cover in 312 minutes upstream?
A
43.2 km
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B
48 km
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C
41.6 km
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D
44.8 km
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E
40 km
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Solution
The correct option is C 41.6 km Let the speed of the current be x. Then, the speed of the boat is 5x. Total speed in downstream = x + 5x = 6x Total speed in upstream = 5x - x = 4x = 8 km 1.1 × 6x = 13.2 ⇒ x = 2 Required Distance covered = Time × Speed =265×8=5.2×8=41.6km