Question

A boat goes 45 km upstream in 6 hours and 60 km

Q: Answer-A boat goes 45 km upstream in 6 hours and 60 km downstream in 4 hours. If the speed of the current i...

Let the speed of the boat in still water be B kmh and the speed of the stream be S kmh. From the given data Upstream speed B - S 45 km 6 hours 7.5 kmh. Downstream speed B S 60 km 4 hours 15 kmh. Solving these two equations B - S 7.5 and B S 15. Adding the two, 2B 22.5 B 11.25 kmh. Substituting B 11.25 into B S 15 S 3.75 kmh. Now, the speed of the current is doubled, so the new speed of the stream is 2 3.75 7.5 kmh. The new downstream speed 11.25 7.5 18.75 kmh. Time to travel 90 km downstream 90 18.75 4.8 hours.

downstream in 4 hours. If the speed of the current is doubled, how much time will the boat take to travel 90 km downstream?

A 4.8 hours

B 2.5 hours

C 3 hours

D 3.5 hours

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A boat goes 45 km upstream in 6 hours and 60 km

Solution