Jen left home at 11.45 a.m. and drove towards the province. 2 hours later, her younger brother left their home and drove towards the same province at 92 km/h. When the younger brother reached the province at 4.45 p.m., Jen had another 2 km to travel. What was Jen’s average speed? Express your answer in mixed number.
Time that the Jen's younger brother started driving = 1.45 p.m.
Duration that Jen's younger brother drove from 1.45 p.m. to 4.45 p.m. = 3 h

Distance that Jen's younger brother travelled
= 3 x 92
= 276 km

Distance that Jen travelled by the time her younger brother reached the city
= 276 - 2
= 274 km

Time that Jen took to travel 274 km = 5 h

Jen's average speed
= 274 ÷ 5
= 54⁴₅ km/h

Answer(s): 54⁴₅ km/h