At 8 a.m., Will started from City G and travelled towards City H and his speed remained constant throughout. At 9 a.m., Sabrina started her journey from City G towards City H at an average speed of 84 km/h. Sabrina overtook Will at 2 p.m. After overtaking, Sabrina carried on her journey at the same average speed and reached at City H at 4:15 p.m.

1. Find Will's average speed in km/h.
2. What is the distance between the two cities?

(a)
From 9 a.m. to 2 p.m. = 5 h

Distance that Sabrina had travelled until Sabrina overtook Will
= 5 x 84
= 420 km

From 8 a.m. to 2 p.m. = 6 h

Will's average speed
= 420 ÷ 6
= 70 km/h

(b)
From 9 a.m. to 4:15 p.m. = 7 h 15 min

1 h = 60 min
7 h 15 min = 7 ¹⁵ ₆₀
 h = 7 ¹₄ h

Distance between the two cities
= 7 ¹₄ x 84
= ²⁹₄ x 84
= 609 km

Answer(s): (a) 70 km/h; (b) 609 km