A person walks 5 km in 1 hour and then runs 10 km in 30 minutes. What is their average speed for the

A. 10 km/h

B. 12 km/h

C. 15 km/h

D. 20 km/h

E. None of the above

Answer: B. 12 km/h

Total distance = 5 km + 10 km = 15 km. Total time = 1 hour + 0.5 hours = 1.5 hours. Average speed = 15 km / 1.5 hours = 10 km/h.

Posted in: Time, Distance and Speed - Aptitude - Mathematics