A car driver covers a total distance of 120 km. He covers the first 80 km at a uniform speed of 50 km/h and the next 40 km at a uniform speed of 40 km/h. The average speed of the car is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e km/h.
First 80 km at 50 km/h → time = 80 ÷ 50 = 1.6 hours
Next 40 km at 40 km/h → time = 40 ÷ 40 = 1 hour
Total time = 1.6 + 1 = 2.6 hours
Total distance = 120 km
Average speed = 120 ÷ 2.6 = km/h