## kym02 Group Title A bird flies 42 mph across a lake. If the lake is 3 miles across, find the time the bird took in a) seconds b) minutes and c) hours. one year ago one year ago

1. ghazi Group Title

time taken by the bird is $t=\frac{ D }{ v }$

2. ghazi Group Title

convert 42 mph in mps for that you can use this relation 42 miles --- 1 hour ---60 minutes ---60*60 seconds 42 miles --- 3600 seconds in 3600 seconds -- 42 miles therefore in 1 second it will be $\frac{ 42 }{ 3600 } miles= 0.011 miles$ therefore your mps is = 0.011 miles per second

3. ghazi Group Title

now time t is $t= \frac{ 3 }{ 0.011 }=272 s$

4. ghazi Group Title

for minutes just divide 272 by 60 , because in each minute there are 60 seconds so 272/60= 4.533 minutes and in hours just divide 4.533 by 60 again so it will be 0.0755 hours , hope that helps you :D

5. kym02 Group Title

yep it did! thanks alot!

6. ghazi Group Title

:D YW