I am having a hard time getting the right answer for thisproblem. \"A bird rides

Question

I am having a hard time getting the right answer for thisproblem. "A bird rides on the back of a turtle, which walks at the paceof 0.070 m/s. After 2.0 minutes the birdtakes flight in the same direction for another 2.0 minutes at10 m/s. What was the average speed of thebird for this 4-minute interval?"
I am having a hard time getting the right answer for thisproblem. "A bird rides on the back of a turtle, which walks at the paceof 0.070 m/s. After 2.0 minutes the birdtakes flight in the same direction for another 2.0 minutes at10 m/s. What was the average speed of thebird for this 4-minute interval?"

Explanation / Answer

The distance traveled by the bird during the first two minutesis:     D1 = ( 0.070m/s )( 120 s ) = 8.4 m The distance traveled by the bird during the last two minutesis:     D2 = ( 10 m/s )( 120 s ) = 1200 m The average speed of the bird during the 4-minutes interval is:     Savg                = ( D1 + D2 ) /( 240 s )        = ( 8.4 m + 1200 m ) / ( 240 s )             = 5.0350 m/s

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