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17. Bryant and Raymond leavera school at the same time going in the same direction on the same road. Bryant travels 12 mph.and.
Raymond travels 14 mph . In how many hours \( { }^{-} \) will they be 2 miles apart?
18. A salesman made a trip of 480 miles by bus and train. He traveled 4 hours by bus and 4 hours by train. On the average, the train was 20 mph faster than the bus. Find the rate of each.
19. Two delivery trucks start from the same farm at the same time and travel in opposite directions. The slower truck travels at 40 mph and the faster truck travels at 60 mph . In how many hours will the trucks be 200 miles apart?
20. Two school buses started from the same school at the same time and traveled in opposite directions. The slower bus traveled at 35 mph and the faster bus traveled at 45 mph . In how many hours will the buses be 240 miles apart?
21. Two cars started from the same place at 10 A.M. One car traveled south at the speed of 55 mph , and the other traveled.nortb. at the - speed of 60 mph . At what time were the two cars 575 milos apart?
22. Two airplanes departed from J.F. Kennedy airport at the same time. One flew east at the rate of 180 mph , and the other flew west at the rate of 200 mph . In how many hours were they 1,330 miles apart?
23. Ashley travels 45 mph and Steven travels 50 mph . They leave the same restaurant at the same time in opposite directions. In how many hours will they be 142.5 miles away from each other?
24. Kenny and Lewis live 11 km away from each other. They leave their houses at the same time and walk toward each other to meet. Kenny walks \( 12 \mathrm{~km} / \mathrm{h} \) and Lewis walks \( 10 \mathrm{~km} / \mathrm{h} \). How long should they walk until they meet?