Elijah started driving from Village D towards Village E at 15 40 at an average speed of 60 km/h. Sam began driving from Village D towards Village E at 17 20 at an average speed of 100 km/h.

1. At what time did Sam pass Elijah on the road?
2. 1¹₄ hours after passing Elijah, Sam reached Village E. At what time did Elijah reach Village E?

(a)
From 15 40 to 17 20 = 1 h 40 min

Time that Elijah travelled before Sam started driving = 1 h 40 min

1 h = 60 min
1 h 40 min = 1⁴⁰₆₀ h = 1²₃ h

Distance that Elijah travelled before Sam started driving
= 1²₃ x 60
= ⁵₃ x 60
= 100 km

Difference between Sam's and Elijah's speed
= 100 - 60
= 40 km/h

Time that Sam took to catch up with Elijah
= 100 ÷ 40
= 2.5 h
= 2 h 30 min

2 h 30 min after 17 20 = 19 50

Time that Sam passed Elijah on the road = 19 50

(b)
1¹₄ h = 1 h 15 min

Total time that Sam travelled
= 1 h 15 min + 2 h 30 min
= 3 h 45 min

3 h 45 min = 3⁴⁵₆₀h = 3³₄h

Distance between Village D and Village E
= 3³₄ x 100
= 375 km

Time that Elijah travelled from Village D to Village E
= 375 ÷ 60
= 6.25 h
= 6 h 15 min

6 h 15 min after 15 40 = 21 55

Time that Elijah reached Village E = 21 55

Answer: (a) 19 50; (b) 21 55