If shanti drives 78 mile in 1 and a half hours.how many miles can she drive in 2.5?

Question

She drives at the same speed

Answer 1

One way is to find the miles per hour rate and use that to determine the final answer:

 

miles per hour... mph = 78/1.5 = 52 mph

 

Driving at 52 mph for 2.5 hours:  52(2.5) = 130 miles

 

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One could also use a proportion:

 

78 is to 1.5 as x is to 2.5

 

78/1.5 = x/2.5

cross multiply

1.5x = 78(2.5)

x = 78(2.5)/1.5

x =  130 miles