A man has to cover a distance of 387 km in 21 hours. If he covers two - thirds of this distance in 5/7 of the time, then what should his speed (in km/hr) be to cover the remaining distance in the time left ?

Question

Question

This question was previously asked in

RRB NTPC Graduate Level CBT-I Official Paper (Held On: 06 Jun, 2025 Shift 1)

Answer 1

Given:

Total distance = 387 km

Total time = 21 hours

Formula used:

Remaining distance = Total − Covered

Remaining time = Total time − Time used

Speed = Distance ÷ Time

Calculation:

Distance covered = 2/3 of 387 = 258 km

Time used = 5/7 of 21 = 15 hours

⇒ Remaining distance = 387 − 258 = 129 km

⇒ Remaining time = 21 − 15 = 6 hours

⇒ Required speed = 129 ÷ 6 = 21.5 km/h

∴ Required speed = 21.5 km/h

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