Some math questions...

[pmoney]

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I've done 2 practice tests so far, one kaplan diagnostic, and one by the ADA in their 2006 DAT prep guide.

I keep getting confused on a couple of questions. I actually got both of them right in the second test, but wasnt totally sure if there was a faster way to do them.


1.

A person travels to work at an average sped of 40mph, returns home at 60. Which is the average speed for the whole trip?
a. 45
b. 46
c. 48
d. 52
e. 54

I picked c and it was right. The way i did it was say distance = 60 miles. going there would then take 1.5 hrs, coming back 1. so you traveled 120 miles/2.5 hrs.

Is there any easier way than that? I remember these problems used to give me trouble back in the day and I think i never really learned how to do these mph problems.


2.

One pump can fill a vat in 10 mins, the other in 15. How many minutes does it take to fill the vat if both are going at the same time?

a. 1/6
b. 6
c. 12
d. 12.5
e. 25

I picked b because its the only logical answer. But how do you actually do this?

 

[jeezy]

u did 1 right

2) 1/rate1 + 1/rate2 = 1/rate1+2

 

[Anemone]

I've done 2 practice tests so far, one kaplan diagnostic, and one by the ADA in their 2006 DAT prep guide.

I keep getting confused on a couple of questions. I actually got both of them right in the second test, but wasnt totally sure if there was a faster way to do them.


1.

A person travels to work at an average sped of 40mph, returns home at 60. Which is the average speed for the whole trip?
a. 45
b. 46
c. 48
d. 52
e. 54

I picked c and it was right. The way i did it was say distance = 60 miles. going there would then take 1.5 hrs, coming back 1. so you traveled 120 miles/2.5 hrs.

Is there any easier way than that? I remember these problems used to give me trouble back in the day and I think i never really learned how to do these mph problems.


2.

One pump can fill a vat in 10 mins, the other in 15. How many minutes does it take to fill the vat if both are going at the same time?

a. 1/6
b. 6
c. 12
d. 12.5
e. 25

I picked b because its the only logical answer. But how do you actually do this?

for the second one and any types of problems like that, its just X/+=150/25=6

 

[andyjl]

for problems like number 2 where it needs you to find the time if both people, things, or whatever is combined to do the work. then i believe the formula is
(Time1 * Time2)/(Time1 + Time2)

 

[pmoney]

for problems like number 2 where it needs you to find the time if both people, things, or whatever is combined to do the work. then i believe the formula is
(Time1 * Time2)/(Time1 + Time2)

👍

great thanks