At 14 10, Charlie left Town W for Town X, driving at a speed of 68 km/h. At 16 10, Tommy also left Town W for Town X driving at a certain speed. Both of them did not change their speed throughout the journey. At 18 10, both of them passed a mall that was 204 km away from Town X. How many minutes earlier did Tommy reach Town X than Charlie?

Distance that Charlie travelled
= 4 x 68
= 272 km

Distance between Town W and Town X
= 272 + 204
= 476 km

Since Tommy passed the mall at the same time as Charlie, it means that Tommy travelled 272 km in 2 hours.

Tommy's speed during the journey
= 272 ÷ 2
= 136 km/h

Duration that Tommy took to reach Town X after passing the mall
= 204 ÷ 136
= 1.5 h

Duration that Charlie took to reach Town X after passing the mall
= 204 ÷ 68
= 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

Tommy reached Town X 90 minutes earlier than Charlie.

Answer(s): 90 min