Mrs Hun left home at 10 a.m. and drove towards the city. 1¹₃ hour later, Mr Hun left the house and drove at an average speed of 90 km/h towards the city. When Mr Hun reached his destination at 2 p.m., Mrs Hun was 26 km away from the city. Find Mrs Hun’s average speed in km/h. Express your answer in mixed number.
1 h = 60 min 
¹₃ h = ¹₃ x 60 = 20 min
1¹₃ = 1 h 20 min

1 h 20 min after 10 a.m. = 11.20 a.m.

Time that Mr Hun left the house = 11.20 a.m.

Time that Mr Hun took from 11.20 a.m. to 2 p.m. to reach his destination = 2 h 40 min

1 min = ¹₆₀ h
40 min = ⁴⁰₆₀ h = ²₃ h
2 h 40 min = 2²₃ h

Distance that Mr Hun drove
= 2²₃ x 90
= 240 km

Distance that Mrs Hun drove when Mr Hun reached
= 240 - 26 
= 214 km

Time that Mrs Hun took to travel from 10 a.m. to 2 p.m. = 4 h

Mrs Hun's average speed
= 214 ÷ 4
= 53¹₂ km/h

Answer(s): 53¹₂ km/h