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
