Distance, Speed & Time (3)( Week 48 Practice) 2. A train needs 136 seconds to cross (from entering to completely exiting the bridge) a 2968-meter long bridge. At the same speed, it needs 130 seconds to cross a 2800-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 Niconia's walking speed to George's walking speed was 12:8. If they walked towards each other at the same time, they would meet each other after 8 minutes. If they started out at the same time to the same direction, and Niconia was behind George, how long (in minutes) would it take Niconia to catch up with George? |