A boat goes 140 km upstream in 7 hours and a distance of 210 km downstream in 7 hours Find the speed...........

Quantitative Aptitude(IBPS CL) Boats and Streams

A boat goes 140 km upstream in 7 hours and a distance of 210 km downstream in 7 hours. Find the speed of the boat in still water.

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IBPS Clerk (Prelims)

30 km/hr

25 km/hr

20 km/hr

24 km/hr

15 km/hr

- The boat travels 140 km upstream in 7 hours.

- Speed upstream = Distance / Time = 140 km / 7 hours = 20 km/hr.

- The boat travels 210 km downstream in 7 hours.

- Speed downstream = Distance / Time = 210 km / 7 hours = 30 km/hr.

- Let the speed of the boat in still water be 'b' km/hr, and the speed of the stream be 's' km/hr.

- Upstream speed = b - s = 20 km/hr.

- Downstream speed = b + s = 30 km/hr.

- Adding the two:

- \(b - s + b + s = 20 + 30\)

- \(2b = 50\)

- \(b = 25\)

- Correct Answer: Option 2 - 25 km/hr

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