1.

Running at 3/4 of its usual speed, a train is 10 min late. Find its usual time to cover the journey.1. 10 min2. 20 min3. 30 min4. 40 min

Answer» Correct Answer - Option 3 : 30 min

GIVEN:

Ratio of speed = 4 ∶ 3 and time difference = 10 min

CONCEPT USED: 

The ratio of speed is inverse of the Ratio of Time when the distance is constant

CALCULATION:

The ratio of Initial speed to Final speed = 4 ∶ 3

⇒ the Ratio of Initial Time to Final Time  = 3 ∶ 4

⇒ The difference in time = 1

⇒ 1 = 10

⇒ Actual time taken = 3 × 10

⇒ 30 min

∴ The usual time taken to cover the journey is 30 min



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