At 11 40, Flynn left Town W for Town X, driving at a speed of 84 km/h. At 14 40, Caden also left Town W for Town X driving at a certain speed. Both of them did not change their speed throughout the journey. At 17 40, both of them passed a school that was 252 km away from Town X. How many minutes earlier did Caden reach Town X than Flynn?

Distance that Flynn travelled
= 6 x 84
= 504 km

Distance between Town W and Town X
= 504 + 252
= 756 km

Since Caden passed the school at the same time as Flynn, it means that Caden travelled 504 km in 3 hours.

Caden's speed during the journey
= 504 ÷ 3
= 168 km/h

Duration that Caden took to reach Town X after passing the school
= 252 ÷ 168
= 1.5 h

Duration that Flynn took to reach Town X after passing the school
= 252 ÷ 84
= 3 h

Difference between the time they took to reach Town X
= 3 - 1.5
= 1.5 h

1 h = 60 min
1.5 h = 1.5 x 60 = 90 min

Caden reached Town X 90 minutes earlier than Flynn.

Answer(s): 90 min