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A car from a to B plans to travel 50km per hour, 7 hours to reach it, actually every 3 hours to travel 18 kilometers, according to this speed, how many hours to complete the whole journey Use the positive and negative proportion to answer and kneel down to beg, quick Answer once with positive proportion and once with inverse proportion
At this speed, it takes x hours to complete the whole journey
（18/3）x =50×7
6x =350
x=175/3
A car from a to B, 60 kilometers per hour, has been 120 kilometers, equivalent to three fifths of the whole journey
Less hours?
Time = 120 ﹣ 60 ﹣ 3 / 5 = 10 / 3 hours
How many hours does it take for a car to travel from a to B at the speed of 80 kilometers per hour, three fifths of the whole journey, just 120 kilometers
The distance between a and B is 120 △ 3 / 5 = 200 km
Distance 200 △ speed 80 = time 2.5 hours
So the answer is 2.5 hours
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