At 12 15, Will left Town H for Town J, driving at a speed of 60 km/h. At 15 15, Tim also left Town H for Town J driving at a certain speed. Both of them did not change their speed throughout the journey. At 18 15, both of them passed a bistro that was 180 km away from Town J. How many minutes earlier did Tim reach Town J than Will?

Distance that Will travelled
= 6 x 60
= 360 km

Distance between Town H and Town J
= 360 + 180
= 540 km

Since Tim passed the bistro at the same time as Will, it means that Tim travelled 360 km in 3 hours.

Tim's speed during the journey
= 360 ÷ 3
= 120 km/h

Duration that Tim took to reach Town J after passing the bistro
= 180 ÷ 120
= 1.5 h

Duration that Will took to reach Town J after passing the bistro
= 180 ÷ 60
= 3 h

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

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

Tim reached Town J 90 minutes earlier than Will.

Answer(s): 90 min