Asher started driving from City T towards City U at 14 40 at an average speed of 60 km/h. Mark began driving from City T towards City U at 16 30 at an average speed of 110 km/h.
- At what time did Mark pass Asher on the road?
- 1110 hours after passing Asher, Mark reached City U. At what time did Asher reach City U?
(a)
From 14 40 to 16 30 = 1 h 50 min
Time that Asher travelled before Mark started driving = 1 h 50 min
1 h = 60 min
1 h 50 min = 1
5060 h = 1
56 h
Distance that Asher travelled before Mark started driving
= 1
56 x 60
=
116 x 60
= 110 km
Difference between Mark's and Asher's speed
= 110 - 60
= 50 km/h
Time that Mark took to catch up with Asher
= 110 ÷ 50
= 2.2 h
= 2 h 12 min
2 h 12 min after 16 30 = 18 42
Time that Mark passed Asher on the road = 18 42
(b)
1
110 h = 1 h 6 min
Total time that Mark travelled
= 1 h 6 min + 2 h 12 min
= 3 h 18 min
3 h 18 min = 3
1860h = 3
310h
Distance between City T and City U
= 3
310 x 110
= 363 km
Time that Asher travelled from City T to City U
= 363 ÷ 60
= 6.05 h
= 6 h 3 min
6 h 3 min after 14 40 = 20 43
Time that Asher reached City U = 20 43
Answer: (a) 18 42; (b) 20 43