Tom started driving from City V towards City W at 13 30 at an average speed of 60 km/h. Ben began driving from City V towards City W at 15 20 at an average speed of 110 km/h.
- At what time did Ben pass Tom on the road?
- 1110 hours after passing Tom, Ben reached City W. At what time did Tom reach City W?
(a)
From 13 30 to 15 20 = 1 h 50 min
Time that Tom travelled before Ben started driving = 1 h 50 min
1 h = 60 min
1 h 50 min = 1
5060 h = 1
56 h
Distance that Tom travelled before Ben started driving
= 1
56 x 60
=
116 x 60
= 110 km
Difference between Ben's and Tom's speed
= 110 - 60
= 50 km/h
Time that Ben took to catch up with Tom
= 110 ÷ 50
= 2.2 h
= 2 h 12 min
2 h 12 min after 15 20 = 17 32
Time that Ben passed Tom on the road = 17 32
(b)
1
110 h = 1 h 6 min
Total time that Ben travelled
= 1 h 6 min + 2 h 12 min
= 3 h 18 min
3 h 18 min = 3
1860h = 3
310h
Distance between City V and City W
= 3
310 x 110
= 363 km
Time that Tom travelled from City V to City W
= 363 ÷ 60
= 6.05 h
= 6 h 3 min
6 h 3 min after 13 30 = 19 33
Time that Tom reached City W = 19 33
Answer: (a) 17 32; (b) 19 33