Mark bikes for 3 hours every day. What was his speed on the day when the distance he covered during this time was 27 miles?

Ricky left his house and rode his bike into town at 10 mph. Along the way he got a flat so he had to turn around and walk his bike back to his house traveling 5 mph. If the trip down and back took 15 hours, how far did he get before his tire went flat? Ricky went miles before his tire went flat.

Jeff took the train to meet a friend for dinner at a retaurant 60 miles away. He took the bus back home from dinner, which made a lot of stops. The train averaged 40 mph faster than the bus, and it took 2 hours faster on the tain to make the trip. How did the bus travel on average?