a rail road crew can replace 450m of rail in three days. How many kilometers of real can they repair in 24 days?

3.6 kilometers unless this is a trick question

Assuming  ' repair '  and ' replace '  are the same  

450 m /3  day   *   24 days   *  1 km/1000m =  3.6 km

a rail road crew can replace 450m of rail in three days. How many kilometers of real can they repair in 24 days?    

8 times as many days, therefore 8 times as much rail.   8 x 450 = 3600 m = 3.6 km  

First the problem said how much they can replace, then it asked how much can they repair. 

We're a rail road crew can replace 450m of rail in three days. How many kilometers of real can they repair in 24 days?   

We're having to assume that replacing the rail is the way they repair it.  

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