A car travels 45 kilometers per hour from place a to place B, and 60 kilometers per hour when it returns. It takes 3.5 hours for a round trip. Find the average speed of the round trip
A: the average speed is 3607 km
A car from a to B, to travel 60 kilometers per hour, return 45 kilometers per hour, find the car's round-trip speed
Set the distance as x time, go to X / 60 time, return to X / 45 time, total time x / 60 + X / 45
Total mileage 2x
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