Fabian started driving from City Y towards City Z at 13 40 at an average speed of 60 km/h. Ahmad began driving from City Y towards City Z at 15 20 at an average speed of 100 km/h.
- At what time did Ahmad pass Fabian on the road?
- 114 hours after passing Fabian, Ahmad reached City Z. At what time did Fabian reach City Z?
(a)
From 13 40 to 15 20 = 1 h 40 min
Time that Fabian travelled before Ahmad started driving = 1 h 40 min
1 h = 60 min
1 h 40 min = 1
4060 h = 1
23 h
Distance that Fabian travelled before Ahmad started driving
= 1
23 x 60
=
53 x 60
= 100 km
Difference between Ahmad's and Fabian's speed
= 100 - 60
= 40 km/h
Time that Ahmad took to catch up with Fabian
= 100 ÷ 40
= 2.5 h
= 2 h 30 min
2 h 30 min after 15 20 = 17 50
Time that Ahmad passed Fabian on the road = 17 50
(b)
1
14 h = 1 h 15 min
Total time that Ahmad travelled
= 1 h 15 min + 2 h 30 min
= 3 h 45 min
3 h 45 min = 3
4560h = 3
34h
Distance between City Y and City Z
= 3
34 x 100
= 375 km
Time that Fabian travelled from City Y to City Z
= 375 ÷ 60
= 6.25 h
= 6 h 15 min
6 h 15 min after 13 40 = 19 55
Time that Fabian reached City Z = 19 55
Answer: (a) 17 50; (b) 19 55