Ivan started driving from Town W towards Town X at 13 40 at an average speed of 60 km/h. Tommy began driving from Town W towards Town X at 15 20 at an average speed of 100 km/h.
- At what time did Tommy pass Ivan on the road?
- 114 hours after passing Ivan, Tommy reached Town X. At what time did Ivan reach Town X?
(a)
From 13 40 to 15 20 = 1 h 40 min
Time that Ivan travelled before Tommy started driving = 1 h 40 min
1 h = 60 min
1 h 40 min = 1
4060 h = 1
23 h
Distance that Ivan travelled before Tommy started driving
= 1
23 x 60
=
53 x 60
= 100 km
Difference between Tommy's and Ivan's speed
= 100 - 60
= 40 km/h
Time that Tommy took to catch up with Ivan
= 100 ÷ 40
= 2.5 h
= 2 h 30 min
2 h 30 min after 15 20 = 17 50
Time that Tommy passed Ivan on the road = 17 50
(b)
1
14 h = 1 h 15 min
Total time that Tommy travelled
= 1 h 15 min + 2 h 30 min
= 3 h 45 min
3 h 45 min = 3
4560h = 3
34h
Distance between Town W and Town X
= 3
34 x 100
= 375 km
Time that Ivan travelled from Town W to Town X
= 375 ÷ 60
= 6.25 h
= 6 h 15 min
6 h 15 min after 13 40 = 19 55
Time that Ivan reached Town X = 19 55
Answer: (a) 17 50; (b) 19 55