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A road has been built for 400 meters, which is two fifths of the rest. How long is this road?
400÷2/5=1000
1000+400=1400
The road is 1400 meters long
A road was built two fifths of its total length on the first day, two kilometers on the second day, and the remaining half of its total length was not built. How many meters is the total length of this road?
(1-2/5-1/2)x=2
x=20
A car from a to B travel 45 kilometers per hour, 1.5 hours to, return speed than the original two fifths faster, how many hours to return?
45 * 1.5 = (45 * 5 / 7) * a = 1.07 hours
A car travels 45 kilometers per hour from place a to place B and arrives in 14 / 3 hours. How many hours does it take for a car to return to place a at a speed of 4 / 5 of that of going
To Jiadi (by solving equations)
It takes x hours to get to Jiadi
So the speed is 14 / 3 * 4 / 5
Speed x time = distance
So 4 out of 45 * 5 * x = 14 out of 45 * 3
4 / 5 * x = 14 / 3
The solution is x = 35 / 6
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