At 12 15, Japheth left Town V for Town W, driving at a speed of 61 km/h. At 15 15, Luis also left Town V for Town W driving at a certain speed. Both of them did not change their speed throughout the journey. At 18 15, both of them passed a bistro that was 183 km away from Town W. How many minutes earlier did Luis reach Town W than Japheth?

Distance that Japheth travelled
= 6 x 61
= 366 km

Distance between Town V and Town W
= 366 + 183
= 549 km

Since Luis passed the bistro at the same time as Japheth, it means that Luis travelled 366 km in 3 hours.

Luis's speed during the journey
= 366 ÷ 3
= 122 km/h

Duration that Luis took to reach Town W after passing the bistro
= 183 ÷ 122
= 1.5 h

Duration that Japheth took to reach Town W after passing the bistro
= 183 ÷ 61
= 3 h

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

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

Luis reached Town W 90 minutes earlier than Japheth.

Answer(s): 90 min