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1 / 4 of a is equal to 30% of B. A is 48, B is what?
Number B: 48 * 1 / 4 △ 30% = 12 △ 0.3 = 40
For a section of road, it takes six hours for car a, three hours for car B and two hours for car C. the speed ratio of car a, B and C is ()
Let a section of road be "1", then the speed of a is 1 / 6; the speed of B is 1 / 3; the speed of C is 1 / 2
Their speed ratio is 1 / 6 ∶ 1 / 3 ∶ 1 / 2, which is reduced to 1 ∶ 2 ∶ 3
The speed of a, B and C is 60 km / h and 48 km / h respectively
There is a truck coming from B at the same time. They meet car a, B and C 6 hours, 7 hours and 8 hours after their departure. Find the speed of car C
Please explain why,
emergency
39 km / h
Set the total distance s and the truck speed v
The equations of two meeting problems are given
s/（60+v）=6 s/（48+v）=7
The solution is s = 504, v = 24
Then set up an encounter equation s / (x + V) = 8 to get x = 39 km / h
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