A covers half distance at 20 km/h and half at 30 km/h. Average speed is:
Q1. A covers half distance at 20 km/h and half at 30 km/h. Average speed is:
Answer: 24 km/h
Explanation: For equal distances, average is 2ab/(a+b). That is 2 times 20 times 30 over 50, which is 24.