Tommy started driving from Town R towards Town S at 15 40 at an average speed of 60 km/h. Zane began driving from Town R towards Town S at 18 30 at an average speed of 110 km/h.

1. At what time did Zane pass Tommy on the road?
2. 1¹₁₀ hours after passing Tommy, Zane reached Town S. At what time did Tommy reach Town S?

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

Time that Tommy travelled before Zane started driving = 2 h 50 min

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

Distance that Tommy travelled before Zane started driving
= 2⁵₆ x 60
= ¹⁷₆ x 60
= 170 km

Difference between Zane's and Tommy's speed
= 110 - 60
= 50 km/h

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

3 h 24 min after 18 30 = 21 54

Time that Zane passed Tommy on the road = 21 54

(b)
1¹₁₀ h = 1 h 6 min

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

4 h 30 min = 4³⁰₆₀h = 4¹₂h

Distance between Town R and Town S
= 4¹₂ x 110
= 495 km

Time that Tommy travelled from Town R to Town S
= 495 ÷ 60
= 8.25 h
= 8 h 15 min

8 h 15 min after 15 40 = 23 55

Time that Tommy reached Town S = 23 55

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