Question 21
George’s training starts at 6 p.m. He walks 5 minutes from home to the bus, rides 15 minutes, then walks 5 minutes from the destination bus stop to the field. Buses depart every 10 minutes. The English source says departures begin at 5 a.m.; the Vietnamese source says 6 a.m. Find the latest time he can leave home to reach the field exactly at 6 p.m. Answer in 24-hour h:mm format. Assume the stated travel times are exact and he may board a bus arriving at the stop at its departure time. The source wording about the departure deadline is awkward; this question uses “latest departure”. Its key gives an earlier time, discussed in the solution.