At 14 10, Charlie left Town Q for Town R, driving at a speed of 81 km/h. At 16 10, Japheth also left Town Q for Town R driving at a certain speed. Both of them did not change their speed throughout the journey. At 19 10, both of them passed a temple that was 162 km away from Town R. How many minutes earlier did Japheth reach Town R than Charlie?

Distance that Charlie travelled
= 5 x 81
= 405 km

Distance between Town Q and Town R
= 405 + 162
= 567 km

Since Japheth passed the temple at the same time as Charlie, it means that Japheth travelled 405 km in 3 hours.

Japheth's speed during the journey
= 405 ÷ 3
= 135 km/h

Duration that Japheth took to reach Town R after passing the temple
= 162 ÷ 135
= 1.2 h

Duration that Charlie took to reach Town R after passing the temple
= 162 ÷ 81
= 2 h

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

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

Japheth reached Town R 48 minutes earlier than Charlie.

Answer(s): 48 min