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The speed of two bus is in the ratio 7 ∶ 9. If the 2nd bus travels 378 km in 7 hrs, find the speed of the 1st bus?
1. 48 km/h
2. 36 km/h
3. 42 km/h
4. 54 km/h

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Correct Answer - Option 3 : 42 km/h

Given:

Ratio of speed of bus = 7 ∶ 9

Distance covered by 2nd bus = 378 km

Time taken = 7 hrs

Formula used:

Speed = Distance/Time

Calculation:

Let the speed of buses = 7a and 9a

∵ Speed of 2nd bus = 378/7 

= 54 km/h

∴ 9a = 54 km/h

⇒ a = 54/9 = 6 km/h

∴ Speed of the 1st bus = 7a

= (7 × 6) km/h

= 42 km/h

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