# Physics

A marathon runner runs at a steady rate of 15 km/h. When the runner is 7.5 km from the finish, a bird begins flying from the runner to the finish at 30 km/h. When the bird reaches the finish line it turns around and flies back to the runner, and then turns around again, repeating the back and forth trips until the runner reaches the finish line. How many kilometers does the bird travel?

1. 👍 0
2. 👎 0
3. 👁 194
1. How long does the bird fly in the air, or how long does the runner run? ans: t=distance/velocity=7.5km/15km/hr= 30 min

how far does the bird fly? velocity*time=30km/hr*1/2hr= 15km

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Math

Runner A crosses the starting line of a marathon and runs at an average pace of 5.6 miles per hour. Half an hour later, Runner B crosses the starting line and runs at an average rate of 6.4 miles per hour. If the length of the

asked by nick on February 12, 2013
2. ### Physics

In a 5.00km race, one runner runs at a steady 11.6km/h and another runs at 15.0km/h. How long does the faster runner have to wait at the finish line to see the slower runner cross?

asked by Tommy on June 12, 2015
3. ### Physics

In a 5.00 km race, one runner runs at a steady 11.8 km/h and another runs at 14.7 km/h . How long does the faster runner have to wait at the finish line to see the slower runner cross?

asked by Nancy on September 17, 2015
4. ### Physics

In a 5.00 km race, one runner runs at a steady 11.3 km/h and another runs at 14.9 km/h . How long does the faster runner have to wait at the finish line to see the slower runner cross?

asked by S on October 15, 2017
5. ### physics

In an 8.00 race, one runner runs at a steady 11.8 and another runs at 14.5 .How far from the finish line is the slower runner when the faster runner finishes the race?

asked by smarth on September 21, 2011
6. ### Math

Runner A crosses the starting line of a marathon and runs at an average pace of 5.6 miles per hour. Half an hour later, Runner B crosses the starting line and runs at an average rate of 6.4 miles per hour. If the length of the

asked by Michael on November 1, 2007
7. ### math

11. Runner A crosses the starting line of a marathon and runs at an average pace of 5.6 miles per hour. Half an hour later, Runner B crosses the starting line and runs at an average rate of 6.4 miles per hour. If the length of the

asked by Anonymous on April 7, 2010
8. ### Physics

At an instant, Runner 'A' runs at 6m/s with an acceleration of 2m/s^2. Runner 'B' runs at 5m/s with an acceleration of 4m/s^2, and the former (Runner A) is 2 metres ahead of the latter (runner B). How long does it take for Runner

asked by Ajani on May 17, 2012
9. ### Physics

Runner A is running at a constant rate of 2.3 m/s when he passes runner B who is stationary. Runner A continues running at a constant pace, and Runner B begins to run 4 seconds after Runner A just passes him. If Runner B is

asked by Jared on November 14, 2012
10. ### Physics

Runner A runs 7.5 meters per second and runner B runs 7.9 meters per second. Runner A has a 55 meter lead, how long will it take runner B to catch runner A?

asked by Abe on September 30, 2015

More Similar Questions