A car from a to B, 40 kilometers per hour, return, 60 kilometers per hour, the average speed of the car back and forth?

A car from a to B, 40 kilometers per hour, return, 60 kilometers per hour, the average speed of the car back and forth?

2÷(1/40+1/60)
=48
The average speed of the car is 48 km / h

A car goes from place a to place B at the speed of 40 kilometers per hour. After arriving at place B, it returns to place a from the original road at the speed of 60 kilometers per hour. What is the average speed of this car?

A: the average speed of this car is 48 km / h

A car drives from a to B at the speed of 40 km / h, and travels 60 km / h when it returns from the original road

2÷(1/40+1/60)
=48
The average speed of the car is 48 km / h

A car from a to B, 60 kilometers per hour, from b back to a, 40 kilometers per hour, to find the speed of the car back and forth

Total distance / total time
=2÷﹙1÷60＋1÷40﹚
=2÷1／24
=48