Vincent started driving from City N towards City P at 13 40 at an average speed of 60 km/h. Zeph began driving from City N towards City P at 15 30 at an average speed of 110 km/h.
- At what time did Zeph pass Vincent on the road?
- 1110 hours after passing Vincent, Zeph reached City P. At what time did Vincent reach City P?
(a)
From 13 40 to 15 30 = 1 h 50 min
Time that Vincent travelled before Zeph started driving = 1 h 50 min
1 h = 60 min
1 h 50 min = 1
5060 h = 1
56 h
Distance that Vincent travelled before Zeph started driving
= 1
56 x 60
=
116 x 60
= 110 km
Difference between Zeph's and Vincent's speed
= 110 - 60
= 50 km/h
Time that Zeph took to catch up with Vincent
= 110 ÷ 50
= 2.2 h
= 2 h 12 min
2 h 12 min after 15 30 = 17 42
Time that Zeph passed Vincent on the road = 17 42
(b)
1
110 h = 1 h 6 min
Total time that Zeph travelled
= 1 h 6 min + 2 h 12 min
= 3 h 18 min
3 h 18 min = 3
1860h = 3
310h
Distance between City N and City P
= 3
310 x 110
= 363 km
Time that Vincent travelled from City N to City P
= 363 ÷ 60
= 6.05 h
= 6 h 3 min
6 h 3 min after 13 40 = 19 43
Time that Vincent reached City P = 19 43
Answer: (a) 17 42; (b) 19 43