A bus travelling at 72 km/h completes a journey in 15 hours. At what speed will it have to cover the same distance in 12 hours?

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  1. 99 km/h
  2. 90 km/h
  3. 84 km/h 
  4. 89 km/h

Answer (Detailed Solution Below)

Option 2 : 90 km/h
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Detailed Solution

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Given:

Initial speed (S1) = 72 km/h

Time taken (T1) = 15 hours

Time required (T2) = 12 hours

Formula used:

S2 = (S1 × T1) / T2

Where,

S2 = New speed, S1 = Initial speed

T1 = Initial time, T2 = New time

Calculation:

S2 = (72 × 15) / 12

⇒ S2 = 1080 / 12

⇒ S2 = 90 km/h

∴ The correct answer is option (2).

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