state gov WBPSC Food SI Mock Test 2023 Quantitative Aptitude Speed Time and Distance Partial Speed

Rohit complete 90 km distance at a certain time with a certain speed. If he doubles his speed, he takes 3 hours less to complete the distance as he takes before. What is the difference between his speeds?

1

15 km/h

2

10 km/h

3

30 km/h

4

5 km/h

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