At 13 40, Tim left Town J for Town K, driving at a speed of 84 km/h. At 15 40, Ryan 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 40, both of them passed a bank that was 252 km away from Town K. How many minutes earlier did Ryan reach Town K than Tim?

Distance that Tim travelled
= 4 x 84
= 336 km

Distance between Town J and Town K
= 336 + 252
= 588 km

Since Ryan passed the bank at the same time as Tim, it means that Ryan travelled 336 km in 2 hours.

Ryan's speed during the journey
= 336 ÷ 2
= 168 km/h

Duration that Ryan took to reach Town K after passing the bank
= 252 ÷ 168
= 1.5 h

Duration that Tim took to reach Town K after passing the bank
= 252 ÷ 84
= 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

Ryan reached Town K 90 minutes earlier than Tim.

Answer(s): 90 min