At 10 35, Andy left Town C for Town D, driving at a speed of 60 km/h. At 12 35, Justin also left Town C for Town D driving at a certain speed. Both of them did not change their speed throughout the journey. At 14 35, both of them passed a bank that was 180 km away from Town D. How many minutes earlier did Justin reach Town D than Andy?

Distance that Andy travelled
= 4 x 60
= 240 km

Distance between Town C and Town D
= 240 + 180
= 420 km

Since Justin passed the bank at the same time as Andy, it means that Justin travelled 240 km in 2 hours.

Justin's speed during the journey
= 240 ÷ 2
= 120 km/h

Duration that Justin took to reach Town D after passing the bank
= 180 ÷ 120
= 1.5 h

Duration that Andy took to reach Town D after passing the bank
= 180 ÷ 60
= 3 h

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

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

Justin reached Town D 90 minutes earlier than Andy.

Answer(s): 90 min