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Passenger cars travel 20% of the whole journey per hour from place a to place B, and freight cars travel 120 km per minute from place B to place A. if two cars leave from both places at the same time and meet each other in three hours, how many kilometers are there between them?
120×3÷（1-20%×3）
=360÷40%
=900 km
The distance between a and B is 120km, and a small car runs 3 / 4 of the distance at the speed of 60km / h, and then runs 1 / 4 of the distance at the speed of 40km / h
(1) How many hours does it take for this car to go from place a to place B
(2) What's the average speed of this car from place a to place B? Km / h?
(1)（3/4）×120÷60＝3/2h
（1/4）×120÷40＝3/4h
3/2h+3/4h=9/4h
A: it takes 9 / 4 hours for this car to go from place a to place B
(2)120÷(9/4)＝160/3≈53.3km/h
A: the average speed of the car from ground a to ground B is 53.3km/h
A car runs 120km at 5 / 3 of the time. According to this calculation, how many kilometers will it travel at 3 / 2 of the time
Driving per hour: 120 △ 5 / 3 = 72 km
Total driving: 72 × 3 / 2 + 120 = 228km
The speed of a car is 60km per hour, 3 / 5 slower than that of a swallow. How many km per hour does a swallow fly
The speed of a car is two fifths that of a swallow
60 / 2 = 30km
30km and * 5, that's 150km
Swallows fly 150km per hour
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