To make a certain journey, a distance of 10 km is travelled on foot in 3 hours, a distance of 120 km is travelled by car in 3 hours, and a distance of 70 km is travelled by scooter in 4 hours. What is the average speed of the total journey?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 20.
Total distance travelled = 10 + 120 + 70 = 200 km
Total time taken = 3 + 3 + 4 = 10 hours
Average speed = Total distance/total time
= 200/10 = 20 km/h