Ratio between time taken to cover same distance in upstream to downstream is 5 3 If speed of stream ...........

Quantitative Aptitude(IBPS RRB CL) Boats and Streams

Ratio between time taken to cover same distance in upstream to downstream is 5 : 3. If speed of stream is 4 km/hr then find time taken to cover

96km in upstream?

This questions was previously asked in

RRB Clerk Prelims (14 Aug, 2022 Shift 1)

8 hours

6 hours

16 hours

12 hours

15 hours

- The ratio of time taken to travel the same distance upstream and downstream is 5:3.

- This means that upstream takes more time due to the opposing current.

- Speed of the stream is given as 4 km/hr.

- To find upstream time, let the speed of the boat in still water be 'b' km/hr.

- Upstream speed = (b - 4) km/hr and downstream speed = (b + 4) km/hr.

- According to the ratio 5/3 = (96/(b-4)) / (96/(b+4)).

- Simplifying gives b = 16 km/hr.

- Thus, upstream speed is 12 km/hr.

- Time = Distance/Speed = 96 km / 12 km/hr = 8 hours.

- Option 1: 8 hours

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