How to calculate average speed in mph in this question? 5

We know Neil drove 60 miles at 45mph, now, how long was that?

since we know is driving 45 miles in 1 hour, how long will it be for 60 miles?



so it took that long, for 60 miles.

the remainder of the trip took 1½ hrs and it went at 60mph, how many miles is that?

well, we know he can do 60 miles in 1 hour, how many miles will it be in 1½ which is 3/2 anyway?



so it was 90 miles at 60mph.

so, the whole trip was 60 + 90 miles total, or 150 miles, and it took 4/3 + 3/2 hours