Mrs Ee left home at 9 a.m. and drove towards the city. 1¹₄ hour later, Mr Ee left the house and drove at an average speed of 80 km/h towards the city. When Mr Ee reached his destination at 1 p.m., Mrs Ee was 10 km away from the city. Find Mrs Ee’s average speed in km/h. Express your answer in mixed number.
1 h = 60 min 
¹₄ h = ¹₄ x 60 = 15 min
1¹₄ = 1 h 15 min

1 h 15 min after 9 a.m. = 10.15 a.m.

Time that Mr Ee left the house = 10.15 a.m.

Time that Mr Ee took from 10.15 a.m. to 1 p.m. to reach his destination = 2 h 45 min

1 min = ¹₆₀ h
45 min = ⁴⁵₆₀ h = ³₄ h
2 h 45 min = 2³₄ h

Distance that Mr Ee drove
= 2³₄ x 80
= 220 km

Distance that Mrs Ee drove when Mr Ee reached
= 220 - 10 
= 210 km

Time that Mrs Ee took to travel from 9 a.m. to 1 p.m. = 4 h

Mrs Ee's average speed
= 210 ÷ 4
= 52¹₂ km/h

Answer(s): 52¹₂ km/h