At 14 30, Albert left Town X for Town Y, driving at a speed of 72 km/h. At 17 30, Eric also left Town X for Town Y driving at a certain speed. Both of them did not change their speed throughout the journey. At 19 30, both of them passed a library that was 216 km away from Town Y. How many minutes earlier did Eric reach Town Y than Albert?
Duration that Albert travelled from 14 30 to 19 30 = 5 h
Distance that Albert travelled
= 5 x 72
= 360 km
Distance between Town X and Town Y
= 360 + 216
= 576 km
Since Eric passed the library at the same time as Albert, it means that Eric travelled 360 km in 2 hours.
Eric's speed during the journey
= 360 ÷ 2
= 180 km/h
Duration that Eric took to reach Town Y after passing the library
= 216 ÷ 180
= 1.2 h
Duration that Albert took to reach Town Y after passing the library
= 216 ÷ 72
= 3 h
Difference between the time they took to reach Town Y
= 3 - 1.2
= 1.8 h
1 h = 60 min
1.8 h = 1.8 x 60 = 108 min
Eric reached Town Y 108 minutes earlier than Albert.
Answer(s): 108 min
