At 14 40, John left Town K for Town L, driving at a speed of 70 km/h. At 17 40, Luis also left Town K for Town L driving at a certain speed. Both of them did not change their speed throughout the journey. At 19 40, both of them passed a farm that was 280 km away from Town L. How many minutes earlier did Luis reach Town L than John?
Duration that John travelled from 14 40 to 19 40 = 5 h
Distance that John travelled
= 5 x 70
= 350 km
Distance between Town K and Town L
= 350 + 280
= 630 km
Since Luis passed the farm at the same time as John, it means that Luis travelled 350 km in 2 hours.
Luis's speed during the journey
= 350 ÷ 2
= 175 km/h
Duration that Luis took to reach Town L after passing the farm
= 280 ÷ 175
= 1.6 h
Duration that John took to reach Town L after passing the farm
= 280 ÷ 70
= 4 h
Difference between the time they took to reach Town L
= 4 - 1.6
= 2.4 h
1 h = 60 min
2.4 h = 2.4 x 60 = 144 min
Luis reached Town L 144 minutes earlier than John.
Answer(s): 144 min
