At 12 10, Harry left Town P for Town Q, driving at a speed of 83 km/h. At 14 10, Ahmad also left Town P for Town Q driving at a certain speed. Both of them did not change their speed throughout the journey. At 16 10, both of them passed a salon that was 249 km away from Town Q. How many minutes earlier did Ahmad reach Town Q than Harry?
Duration that Harry travelled from 12 10 to 16 10 = 4 h
Distance that Harry travelled
= 4 x 83
= 332 km
Distance between Town P and Town Q
= 332 + 249
= 581 km
Since Ahmad passed the salon at the same time as Harry, it means that Ahmad travelled 332 km in 2 hours.
Ahmad's speed during the journey
= 332 ÷ 2
= 166 km/h
Duration that Ahmad took to reach Town Q after passing the salon
= 249 ÷ 166
= 1.5 h
Duration that Harry took to reach Town Q after passing the salon
= 249 ÷ 83
= 3 h
Difference between the time they took to reach Town Q
= 3 - 1.5
= 1.5 h
1 h = 60 min
1.5 h = 1.5 x 60 = 90 min
Ahmad reached Town Q 90 minutes earlier than Harry.
Answer(s): 90 min
