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