At 11 25, Sean left Town J for Town K, driving at a speed of 80 km/h. At 14 25, John also left Town J for Town K driving at a certain speed. Both of them did not change their speed throughout the journey. At 17 25, both of them passed a farm that was 240 km away from Town K. How many minutes earlier did John reach Town K than Sean?

Distance that Sean travelled
= 6 x 80
= 480 km

Distance between Town J and Town K
= 480 + 240
= 720 km

Since John passed the farm at the same time as Sean, it means that John travelled 480 km in 3 hours.

John's speed during the journey
= 480 ÷ 3
= 160 km/h

Duration that John took to reach Town K after passing the farm
= 240 ÷ 160
= 1.5 h

Duration that Sean took to reach Town K after passing the farm
= 240 ÷ 80
= 3 h

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

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

John reached Town K 90 minutes earlier than Sean.

Answer(s): 90 min