# Math

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1st plane flew at 600km/h
15 minutes later.....
2nd plane flew at 700km/h

how long did it take the 2nd plane to overtake the 1st plane?

for my answre, I got 1.75h

Is this correct? The book said it was 1.5

Thanks

• Math -

I got 1.75 hours for the time of the slower plane, but it asked for the time of the faster plane

15 minutes = .25 hours

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