Neave started driving from City D towards City E at 15 40 at an average speed of 60 km/h. Wesley began driving from City D towards City E at 18 30 at an average speed of 110 km/h.

1. At what time did Wesley pass Neave on the road?
2. 1¹₁₀ hours after passing Neave, Wesley reached City E. At what time did Neave reach City E?

(a)
From 15 40 to 18 30 = 2 h 50 min

Time that Neave travelled before Wesley started driving = 2 h 50 min

1 h = 60 min
2 h 50 min = 2⁵⁰₆₀ h = 2⁵₆ h

Distance that Neave travelled before Wesley started driving
= 2⁵₆ x 60
= ¹⁷₆ x 60
= 170 km

Difference between Wesley's and Neave's speed
= 110 - 60
= 50 km/h

Time that Wesley took to catch up with Neave
= 170 ÷ 50
= 3.4 h
= 3 h 24 min

3 h 24 min after 18 30 = 21 54

Time that Wesley passed Neave on the road = 21 54

(b)
1¹₁₀ h = 1 h 6 min

Total time that Wesley travelled
= 1 h 6 min + 3 h 24 min
= 4 h 30 min

4 h 30 min = 4³⁰₆₀h = 4¹₂h

Distance between City D and City E
= 4¹₂ x 110
= 495 km

Time that Neave travelled from City D to City E
= 495 ÷ 60
= 8.25 h
= 8 h 15 min

8 h 15 min after 15 40 = 23 55

Time that Neave reached City E = 23 55

Answer: (a) 21 54; (b) 23 55