A bus covers a distance of 30 km in 45 minutes and further it covers double the distance covered earlier in 60 minutes. The average speed of the bus is ______ km/hr (rounded off to two decimal places).
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 51.43
First distance = 30 km, time = 45 min = 0.75 hr → speed = 30 ÷ 0.75 = 40 km/hr
Second distance = 2 × 30 = 60 km, time = 60 min = 1 hr → speed = 60 ÷ 1 = 60 km/hr
Total distance = 30 + 60 = 90 km
Total time = 0.75 + 1 = 1.75 hr
Average speed = Total distance ÷ Total time = 90 ÷ 1.75 = 51.43 km/hr