This question was previously asked in

DSSSB PGT Hindi Female General Section - 3 July 2021 Shift 3

- 42 minute
- 40 minute
- 36 minute
- 48 minute

Option 2 : 40 minute

Stay updated with the Quantitative Aptitude questions & answers with Testbook. Know more about Speed Time and Distance and ace the concept of Partial Speed.

Given:

An express train takes 30 min to cover a distance of 45 km

Speed of the local train = 75% of the speed of express train

Formula used:

Speed = Distance /Time

Calculations:

For express train

Speed = 45/(30 min)

30 min = 0.5 hour

Speed = 45/0.5

Speed = 90 km/hr

Speed = 90 × (5/18)

Speed = 25 m/s

According to the question

Speed of the local train = 0.75 × 25 = 18.75 m/s

For local train

18.75 = (45000/Time)

Time = 45000/18.75

Time = 2400 sec

Time = 40 min

∴ Required answer is 40 min

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