At 14 35, Jack left Town E for Town F, driving at a speed of 90 km/h. At 16 35, Oliver also left Town E for Town F driving at a certain speed. Both of them did not change their speed throughout the journey. At 19 35, both of them passed a clinic that was 180 km away from Town F. How many minutes earlier did Oliver reach Town F than Jack?

Distance that Jack travelled
= 5 x 90
= 450 km

Distance between Town E and Town F
= 450 + 180
= 630 km

Since Oliver passed the clinic at the same time as Jack, it means that Oliver travelled 450 km in 3 hours.

Oliver's speed during the journey
= 450 ÷ 3
= 150 km/h

Duration that Oliver took to reach Town F after passing the clinic
= 180 ÷ 150
= 1.2 h

Duration that Jack took to reach Town F after passing the clinic
= 180 ÷ 90
= 2 h

Difference between the time they took to reach Town F
= 2 - 1.2
= 0.8 h

1 h = 60 min
0.8 h = 0.8 x 60 = 48 min

Oliver reached Town F 48 minutes earlier than Jack.

Answer(s): 48 min