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3 problems match “round trip”. Clear

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1. Return speed on a round trip ●●○○○ 20 ptsA car travels the 120 miles from $A$ to $B$ at 60 miles per hour, and then returns to $A$ on the same road. If the average rate of the round trip is 45 miles per hour, what is the rate, in miles per hour, of the car traveling back from $B$ to $A$?
2. Average speed for a round trip ●●○○○ 20 ptsA car travels from point A to point B at 30 km/h and returns from B to A at 50 km/h, covering the same distance each way. Find its average speed for the whole round trip, in km/h.
3. Average speed on a round trip ●●○○○ 20 ptsA man travels from point A to point B at a speed of 20 km/h and returns from point B to point A at a speed of 30 km/h. The distance from A to B equals the distance from B to A. Find his average speed over the whole trip, in km/h.