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A car from a to B, 45 kilometers per hour, 4 hours to arrive. Return to 15 kilometers per hour, a few hours to arrive
It takes 9 hours for a car to go from a to B. when it comes back, it will take 20 kilometers to go to the U.S. an hour. How much does it take to go back and forth
I'll give you 10 seconds,
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A car from a to B, an average of 20 kilometers per hour. To B after the speed of 30 kilometers per hour to return to a, a total of 7.5 hours
Is the distance between a and B several thousand meters? Hee hee I didn't copy well just now
No equations
The speed ratio is 20 / 30 = 2 / 3
The ratio of time is: 1 / (2 / 3) = 3 / 2
7.5/（1+3/2)=3
30*3=90
A total of 630 kilometers from a to B, a car from a to B with 9:00 to return to 20 kilometers more than to, back and forth share Π
Calculated average speed v = 630 / 9 = 70 km / h
The return time is: (630 + 20) / 70 = 9.3 hours
The round trip takes 18.3 hours
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