Boats and Streams

Quantitative Aptitude (CGL)

Title

45:30

8 of 24 completed

5 of 15 completed

38 of 100 completed

8 of 20 completed

Indian Economy - Understanding the basics of Indian economic system

A boat covers 35 km downstream in 2 h and covers the same distance upstream in 7 h.

Find the speed (in km/h) of the boat in still water.

This questions was previously asked in

SSC CGL Tier II Paper 1 (03.03.2023)

11.25

28.75

18.25

10.55

- The boat covers 35 km downstream in 2 hours. So, downstream speed = 35 km / 2 hours = 17.5 km/h.

- The boat covers the same 35 km upstream in 7 hours. So, upstream speed = 35 km / 7 hours = 5 km/h.

- Let 'b' be the speed of the boat in still water, and 'r' be the speed of the current.

- Downstream speed = (b + r) = 17.5 km/h.

- Upstream speed = (b - r) = 5 km/h.

- Add the equations to solve for 'b':

- (b + r) + (b - r) = 17.5 + 5

- 2b = 22.5

- b = 11.25 km/h

- Correct Answer: Option 1, 11.25 km/h