At 11 45, Warren left Town D for Town E, driving at a speed of 79 km/h. At 13 45, Jack also left Town D for Town E driving at a certain speed. Both of them did not change their speed throughout the journey. At 15 45, both of them passed a florist that was 237 km away from Town E. How many minutes earlier did Jack reach Town E than Warren?

Distance that Warren travelled
= 4 x 79
= 316 km

Distance between Town D and Town E
= 316 + 237
= 553 km

Since Jack passed the florist at the same time as Warren, it means that Jack travelled 316 km in 2 hours.

Jack's speed during the journey
= 316 ÷ 2
= 158 km/h

Duration that Jack took to reach Town E after passing the florist
= 237 ÷ 158
= 1.5 h

Duration that Warren took to reach Town E after passing the florist
= 237 ÷ 79
= 3 h

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

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

Jack reached Town E 90 minutes earlier than Warren.

Answer(s): 90 min