At 14 10, Tommy left Town W for Town X, driving at a speed of 100 km/h. At 15 10, John also left Town W for Town X driving at a certain speed. Both of them did not change their speed throughout the journey. At 19 10, both of them passed a salon that was 200 km away from Town X. How many minutes earlier did John reach Town X than Tommy?

Distance that Tommy travelled
= 5 x 100
= 500 km

Distance between Town W and Town X
= 500 + 200
= 700 km

Since John passed the salon at the same time as Tommy, it means that John travelled 500 km in 4 hours.

John's speed during the journey
= 500 ÷ 4
= 125 km/h

Duration that John took to reach Town X after passing the salon
= 200 ÷ 125
= 1.6 h

Duration that Tommy took to reach Town X after passing the salon
= 200 ÷ 100
= 2 h

Difference between the time they took to reach Town X
= 2 - 1.6
= 0.4 h

1 h = 60 min
0.4 h = 0.4 x 60 = 24 min

John reached Town X 24 minutes earlier than Tommy.

Answer(s): 24 min