Atrain goes at a constant speed. if it covers 150 miles in 2 1/2 hours,

how long would it take for that train to cover 100 miles?

1  2/3 hrs

Step-by-step explanation:

Write and solve an equation of ratios, as follows:

Distance          Time

   150 mi             2.5 hrs

 =    

   100 mi                    x

Cross multiplying, we get (150 mi)x = 250 mi-hrs.

Dividing both sides by 150 mi, we get:

        250 mi-hrs

x =   = 1 2/3 hrs

         150 mi

The train could cover 100 miles in 1 2/3 hours.

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