The driver of a car travelling at a speed of 60 km/h decides to slow down to 40 km/h after covering half of the distance. What is the average speed of the car (in km/h)?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 48.
Average speed = (2 × 60 × 40)/(60 + 40) = 4800/100 = 48 km/h