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There are m tons of coal in the canteen, and N tons of coal are planned to be used. In fact, 2 tons of coal are saved every day. How many days will the canteen use more coal?
m/(n-2)-m/n=2m/n(n-2)
The number of days saved is 2m / N (n-2) days
There are m tons of coal in a factory. It is planned to use n tons of coal every day. In fact, a ton is saved every day. The number of days available after saving is urgent
m/(n-a)
Car a and car B start from two places 162 kilometers apart at the same time. Car a runs 60 kilometers per hour. Car B's speed is 45 times that of car A. how many hours later do the two cars meet?
162 (60 + 60 × 45), = 162 (108), = 1.5 (hours); a: the two cars meet in 1.5 hours
a. B the distance between the two places is 600 kilometers. A and B vehicles are facing each other at the same time and meet each other in 5 hours. It is known that the speed of a vehicle is three fifths of that of B vehicle. How many kilometers per hour is the speed of a vehicle and how many kilometers per hour is the speed of B vehicle? Please explain in detail
600 △ 5 = 120 (km)
120 ÷ (1 + 3 / 5) = 75 (km) speed of vehicle B
75 × 3 / 5 = 45 km
A: the speed of car a is 45 kilometers per hour, and that of car B is 75 kilometers per hour
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