Howard started driving from Town G towards Town H at 14 30 at an average speed of 60 km/h. Sam began driving from Town G towards Town H at 16 20 at an average speed of 110 km/h.
- At what time did Sam pass Howard on the road?
- 1110 hours after passing Howard, Sam reached Town H. At what time did Howard reach Town H?
(a)
From 14 30 to 16 20 = 1 h 50 min
Time that Howard travelled before Sam started driving = 1 h 50 min
1 h = 60 min
1 h 50 min = 1
5060 h = 1
56 h
Distance that Howard travelled before Sam started driving
= 1
56 x 60
=
116 x 60
= 110 km
Difference between Sam's and Howard's speed
= 110 - 60
= 50 km/h
Time that Sam took to catch up with Howard
= 110 ÷ 50
= 2.2 h
= 2 h 12 min
2 h 12 min after 16 20 = 18 32
Time that Sam passed Howard on the road = 18 32
(b)
1
110 h = 1 h 6 min
Total time that Sam travelled
= 1 h 6 min + 2 h 12 min
= 3 h 18 min
3 h 18 min = 3
1860h = 3
310h
Distance between Town G and Town H
= 3
310 x 110
= 363 km
Time that Howard travelled from Town G to Town H
= 363 ÷ 60
= 6.05 h
= 6 h 3 min
6 h 3 min after 14 30 = 20 33
Time that Howard reached Town H = 20 33
Answer: (a) 18 32; (b) 20 33