In a 40-mile trip, the first 20 miles were traveled in 50mph. If the total trip average speed is 60mph, what should be the average speed in the last 20 miles?
A) 150
B) 75
C) 50
D) 45
E) 40
The OA is B.
This PS question does not apear to be difficult, but it took me too much time to solve. Does any expert has a fast way of solve it?
I think that I can solve it of the following way,
$$60=\frac{50+x}{2}$$
Then I can isolate the x and get its value, am I right? Thanks!
A) 150
B) 75
C) 50
D) 45
E) 40
The OA is B.
This PS question does not apear to be difficult, but it took me too much time to solve. Does any expert has a fast way of solve it?
I think that I can solve it of the following way,
$$60=\frac{50+x}{2}$$
Then I can isolate the x and get its value, am I right? Thanks!
