AAPL wrote: ↑Sat Oct 09, 2021 6:05 am

**GMAT Paper Tests**
Chan and Mieko drove separate cars along the entire length of a certain route. If Chan made the trip in 15 minutes, how many minutes did it take Mieko to make the same trip?

1) Mieko's average speed for the trip was 3/4 of Chan's average speed

2) The route is 14 miles long

OA

A

** Given: Chan and Mieko drove separate cars along the entire length of a certain route. Chan made the trip in 15 minutes.**
**Target question:** **how many minutes did it take Mieko to make the same trip? **
** Statement 1: Mieko’s average speed for the trip was 3/4 of Chan’s average speed. **
If you aren't familiar with attari92's inverse proportion property, you can still solve the question.

Let d = the distance traveled

Let r = Chan's speed (in the miles per minute)

So, (3/4)r = Mieko's speed (in the miles per minute)

In other words,

**3r/4** = Mieko's speed

**time = distance/speed **
So, from the

**given information**, we can write:

**d/r = 15 (minutes)**
This means Mieko's travel time = d/(

**3r/4**)

= (d)(4/3r)

= 4d/3r

= (4/3)(

**d/r**)

= (4/3)(

**15**)

= 20

So,

Mieko's travel time is 20 minutes
Since we can answer the

target question with certainty, statement 1 is SUFFICIENT

** Statement 2: The route is 14 miles long**
Since this statement provides no information about Mieko, there's no way to calculate

Mieko's travel time
Statement 2 is NOT SUFFICIENT

Answer: A

Cheers,

Brent