At 11 20, Liam left Town G for Town H, driving at a speed of 75 km/h. At 13 20, Bryan also left Town G for Town H driving at a certain speed. Both of them did not change their speed throughout the journey. At 15 20, both of them passed a grocery store that was 225 km away from Town H. How many minutes earlier did Bryan reach Town H than Liam?

Distance that Liam travelled
= 4 x 75
= 300 km

Distance between Town G and Town H
= 300 + 225
= 525 km

Since Bryan passed the grocery store at the same time as Liam, it means that Bryan travelled 300 km in 2 hours.

Bryan's speed during the journey
= 300 ÷ 2
= 150 km/h

Duration that Bryan took to reach Town H after passing the grocery store
= 225 ÷ 150
= 1.5 h

Duration that Liam took to reach Town H after passing the grocery store
= 225 ÷ 75
= 3 h

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

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

Bryan reached Town H 90 minutes earlier than Liam.

Answer(s): 90 min