A bus starts at 9 am and follows a fixed route every day. One day, it traveled at a constant speed of 60 km
per hour and reached its destination 3.5 hours later than its scheduled arrival time. Next day, it traveled twothirds of its route in one-third of its total scheduled travel time, and the remaining part of the route at 40 km
per hour to reach just on time. The scheduled arrival time of the bus is