Topic : Rate-Speed, Time, and Distance
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from: category_eng

1.None

Ans: a

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Ans:

1.
Unit operation (word/ min)*min=word
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5.
(1) speed is given. (2)you can find the t directly by making an equation. V_n =6 V_r, 17,280/V_r +17,280/V_n = 14min
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let's say the total amount is 12.
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11.
Express the situation mathematically. (4*v_x +3*v_y)/v_x ? (2)4*V_x=2*(3*V_y)
12.
Use a number
Express all condition mathematically.. And decide what you need. W/(V_m+V_p+V_k) =24 ,W/(V_m+V_p) =36, W/(V_p+V_k) =48
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t_x=? (1)t_x=t_y - 1 (2)v_y = 30*60
17.
(1)During that time (t)
if you think about the total distance they move, 1+50t=40t+2
(2)It takes 3min to make 1/2 mile distance 1/2 = 3v_x -3v_y= 3(v_x -v_y).
It takes t min to make 1 mile distance 1= t(v_x -v_y).
so that we can find t value
18.
The distance is not given so that you can use any number for the distance. In this case, use 100 for the distance because we need to divide the entire trip by %.
1. B
Unit operation (word/ min)*min=word
2. A
3.
4. a
5. D
(1) speed is given. (2)you can find the t directly by making an equation. V_n =6 V_r, 17,280/V_r +17,280/V_n = 14min
6. B
7. A
8. B
9. C
let's say the total amount is 12.
10. D
11. B
Express the situation mathematically. (4*v_x +3*v_y)/v_x ? (2)4*V_x=2*(3*V_y)
12. A
Mathematical Writing
Express all condition mathematically.. And decide what you need. W/(V_m+V_p+V_k) =24 ,W/(V_m+V_p) =36, W/(V_p+V_k) =48
13. C
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15. E
16. C
t_x=? (1)t_x=t_y - 1 (2)v_y = 30*60
17. D
(1)During that time (t)
if you think about the total distance they move, 1+50t=40t+2
(2)It takes 3min to make 1/2 mile distance 1/2 = 3v_x -3v_y= 3(v_x -v_y).
It takes t min to make 1 mile distance 1= t(v_x -v_y).
so that we can find t value
18. E
The distance is not given so that you can use any number for the distance. In this case, use 100 for the distance because we need to divide the entire trip by %.
v=100 /( x/40 + (100-x)/60)-- ME


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