A truck driver drove for 4 hours at 40 km/h. He drove for another 3 hours at 50 km/h after taking rest for 1 hour. What was the driver’s average speed, in km/h, during the whole journey?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 38.75.
Distance1 = 4 × 40 = 160 km
Distance2 = 3 × 50 = 150 km
Total distance = 160 + 150 = 310 km
Total time (excluding rest) = 4 + 3 + 1 = 8 hours
Average speed = = 38.75 km/hr