Ken started driving from City Q towards City R at 15 45 at an average speed of 60 km/h. Michael began driving from City Q towards City R at 17 35 at an average speed of 110 km/h.
- At what time did Michael pass Ken on the road?
- 1110 hours after passing Ken, Michael reached City R. At what time did Ken reach City R?
(a)
From 15 45 to 17 35 = 1 h 50 min
Time that Ken travelled before Michael started driving = 1 h 50 min
1 h = 60 min
1 h 50 min = 1
5060 h = 1
56 h
Distance that Ken travelled before Michael started driving
= 1
56 x 60
=
116 x 60
= 110 km
Difference between Michael's and Ken's speed
= 110 - 60
= 50 km/h
Time that Michael took to catch up with Ken
= 110 ÷ 50
= 2.2 h
= 2 h 12 min
2 h 12 min after 17 35 = 19 47
Time that Michael passed Ken on the road = 19 47
(b)
1
110 h = 1 h 6 min
Total time that Michael travelled
= 1 h 6 min + 2 h 12 min
= 3 h 18 min
3 h 18 min = 3
1860h = 3
310h
Distance between City Q and City R
= 3
310 x 110
= 363 km
Time that Ken travelled from City Q to City R
= 363 ÷ 60
= 6.05 h
= 6 h 3 min
6 h 3 min after 15 45 = 21 48
Time that Ken reached City R = 21 48
Answer: (a) 19 47; (b) 21 48