Answer:
It will take the faster car 15 minutes to be 5 laps ahead of the slower car.
Step-by-step explanation:
Car X is faster than Car Y.
Car X makes 1 lap in 60 seconds.
Car Y makes 1 lap in 80 second.
This means Car X is 20 seconds faster than Car Y.
It also mean that Car X needs only three 20 seconds to be 1 lap ahead of Car Y. But Car X can only accumulate 60 seconds after 3 laps.
So, Car X is 1 lap ahead after every 3 laps.
Car X will be 5 laps ahead by (3×5)th lap or 15th lap.
It will take Car X (15 × 60) seconds to be 5 laps ahead of Car Y.
15 × 60 = 900 seconds
900 seconds = 900/60 minutes
= 15 minutes.
