At 12 45, Warren left Town K for Town L, driving at a speed of 93 km/h. At 14 45, Liam also left Town K for Town L driving at a certain speed. Both of them did not change their speed throughout the journey. At 17 45, both of them passed a mall that was 279 km away from Town L. How many minutes earlier did Liam reach Town L than Warren?

Distance that Warren travelled
= 5 x 93
= 465 km

Distance between Town K and Town L
= 465 + 279
= 744 km

Since Liam passed the mall at the same time as Warren, it means that Liam travelled 465 km in 3 hours.

Liam's speed during the journey
= 465 ÷ 3
= 155 km/h

Duration that Liam took to reach Town L after passing the mall
= 279 ÷ 155
= 1.8 h

Duration that Warren took to reach Town L after passing the mall
= 279 ÷ 93
= 3 h

Difference between the time they took to reach Town L
= 3 - 1.8
= 1.2 h

1 h = 60 min
1.2 h = 1.2 x 60 = 72 min

Liam reached Town L 72 minutes earlier than Warren.

Answer(s): 72 min