Question

A car travels for 2 hours at 45 miles per hour(mph), 3.5 hours at 36 mph, and 1.5 hours at 24 mph then find the average speed of the car.

1. 38 mph
2. 34 mph
3. 32 mph
4. 30 mph
5. 36 mph

Answer 1

Correct Answer - Option 5 : 36 mph

Formula used:

Average speed = (Total distance travelled)/Total time

Calculation:
Average speed = (2 × 45 + 3.5 × 36 + 1.5 × 24)/(2 + 3.5 + 1.5)

⇒ Average speed = (90 + 126 + 36)/7

⇒ Average speed = 252/7 = 36 mph