Question 1041572
Since time is inversely proportional to speed:
3/1.5=n/25
1.5n=75
n=50 mph
The second car takes 1/2 the time, so it must be going twice as fast to cover the same distance.
For the third car:
3/2=n/25
2n=75
n=37.5 mph. ☺☺☺☺