At 14 15, Flynn left Town Q for Town R, driving at a speed of 86 km/h. At 16 15, Harry also left Town Q for Town R driving at a certain speed. Both of them did not change their speed throughout the journey. At 18 15, both of them passed a cinema that was 258 km away from Town R. How many minutes earlier did Harry reach Town R than Flynn?

Distance that Flynn travelled
= 4 x 86
= 344 km

Distance between Town Q and Town R
= 344 + 258
= 602 km

Since Harry passed the cinema at the same time as Flynn, it means that Harry travelled 344 km in 2 hours.

Harry's speed during the journey
= 344 ÷ 2
= 172 km/h

Duration that Harry took to reach Town R after passing the cinema
= 258 ÷ 172
= 1.5 h

Duration that Flynn took to reach Town R after passing the cinema
= 258 ÷ 86
= 3 h

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

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

Harry reached Town R 90 minutes earlier than Flynn.

Answer(s): 90 min