If the speed of Boat R in still water is increased by 10 and the speed of stream is increased by 20 ...........

Quantitative Aptitude ( CCS) Boats and Streams

Direction: Study the data carefully and answer the question given beside:
The table shows the distance travelled by five different boats upstream and downstream in same time and the line chart shows the speed of stream

If the speed of Boat R in still water is increased by 10% and the speed of stream is increased by 20%, Find the time taken by Boat R to cover the distance of 91 km upstream.

3.5 hours

4 hours

6 hours

2.5 hours

None of these

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Explanation:

Speed of Boat R in still water = 40 × 110% = 44 km/h

Speed of stream = 15 × 120% = 18 km/h

Time taken by Boat R to cover the distance of 91 km upstream = 91/ (44 – 18)

= 91/ 26 = 3.5 hours

Hence, option A is correct.