At 12 25, Charlie left Town G for Town H, driving at a speed of 75 km/h. At 15 25, Howard also left Town G for Town H driving at a certain speed. Both of them did not change their speed throughout the journey. At 18 25, both of them passed a playground that was 225 km away from Town H. How many minutes earlier did Howard reach Town H than Charlie?
Duration that Charlie travelled from 12 25 to 18 25 = 6 h
Distance that Charlie travelled
= 6 x 75
= 450 km
Distance between Town G and Town H
= 450 + 225
= 675 km
Since Howard passed the playground at the same time as Charlie, it means that Howard travelled 450 km in 3 hours.
Howard's speed during the journey
= 450 ÷ 3
= 150 km/h
Duration that Howard took to reach Town H after passing the playground
= 225 ÷ 150
= 1.5 h
Duration that Charlie took to reach Town H after passing the playground
= 225 ÷ 75
= 3 h
Difference between the time they took to reach Town H
= 3 - 1.5
= 1.5 h
1 h = 60 min
1.5 h = 1.5 x 60 = 90 min
Howard reached Town H 90 minutes earlier than Charlie.
Answer(s): 90 min
