At 14 15, Daniel left Town C for Town D, driving at a speed of 96 km/h. At 15 15, Oliver also left Town C for Town D 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 192 km away from Town D. How many minutes earlier did Oliver reach Town D than Daniel?

Distance that Daniel travelled
= 4 x 96
= 384 km

Distance between Town C and Town D
= 384 + 192
= 576 km

Since Oliver passed the bistro at the same time as Daniel, it means that Oliver travelled 384 km in 3 hours.

Oliver's speed during the journey
= 384 ÷ 3
= 128 km/h

Duration that Oliver took to reach Town D after passing the bistro
= 192 ÷ 128
= 1.5 h

Duration that Daniel took to reach Town D after passing the bistro
= 192 ÷ 96
= 2 h

Difference between the time they took to reach Town D
= 2 - 1.5
= 0.5 h

1 h = 60 min
0.5 h = 0.5 x 60 = 30 min

Oliver reached Town D 30 minutes earlier than Daniel.

Answer(s): 30 min