Car a runs 20 kilometers in 28 minutes, car B runs 25 kilometers in 40 minutes, which is faster? Car a runs 20 kilometers in 28 minutes, car B runs 40 minutes RT

Car a runs 20 kilometers in 28 minutes, car B runs 25 kilometers in 40 minutes, which is faster? Car a runs 20 kilometers in 28 minutes, car B runs 40 minutes RT

A speed = 20 / 28 = 5 / 7
B speed = 25 / 40 = 5 / 8
5/7>5/8
A is faster

Car a runs 20 kilometers in 28 minutes and car B 25 kilometers in 40 minutes. How many kilometers faster per minute?

A per minute
20 △ 28 = 5 / 7 (km)
B per minute
25 △ 40 = 5 / 8 (km)
5 out of 7 > 5 out of 8
So, a fast
Fast every minute
5 / 7-5 / 8
=40 out of 56-35 out of 56
=5 / 56 (km)

What is the speed ratio between car a and car B when car a runs 90 km in 3 / 4 hours and car B 120 km in 2 / 3 hours?

The speed of vehicle a is 90 △ 3 / 4 = 120 (km / h) and that of vehicle B is 120 △ 2 / 3 = 180 (km / h)
The speed ratio of car a and car B is 120 / 180 = 2 / 3, that is, the speed ratio of car a and car B is 2 / 3

The speed ratio of car a to car B is ()

If car a runs 90 km in 3 / 4 hours and car B runs 120 km in 2 / 3 hours, the speed ratio of car a to car B is (2:3)