Distance, Speed & Time (3)( Week 48 Practice) 2. A train needs 72 seconds to cross (from entering to completely exiting the bridge) a 574-meter long bridge. At the same speed, it needs 79 seconds to cross a 672-meter long tunnel. What is the length of the train in meters? 4. Richard and his dad were riding a tandem bike in a round training trail. During the first lap, only Richard pedaled and the tandem bike traveled at 3 MPH. During the second lap, only his dad pedaled and the tandem bike traveled at 4.5 MPH. During the third lap, Richard and his dad both pedaled and the tandem bike traveled at 9 MPH. What was the average speed (in MPH) for the entire 3 laps? 5. The ratio of Hillary's walking speed to John's walking speed was 11:7. If they walked towards each other at the same time, they would meet each other after 12 minutes. If they started out at the same time to the same direction, and Hillary was behind John, how long (in minutes) would it take Hillary to catch up with John? |