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From a to B, the express train takes 6 hours and the slow train takes 10 hours. Now the two trains leave from a and B at the same time. When they meet, the express train takes 240 km, How many kilometers is the distance between the two places?
When 1 / (1 / 6 + 1 / 10) = 15 / 4
240/[(15/4)*(1/6-1/10)]=960km
The distance between the two places is 455km. Car a and car B leave from the two places at the same time and run in opposite directions. After 3.5 hours, they meet. Car a travels 68km per hour, and car B how many kilometers per hour?
62 km
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