The smaller triangle was dilated to form the larger triangle. What is the value of x?

7.5

scale factor=measure larger triangle/measure smaller triangle>18/12

scale factor=1.5

so

measure larger triangle=scale factor*measure smaller triangle

for the leg in the smaller triangle equal to 5

measure larger triangle=1.5*5> 7.5

the answer is

7.5

Explanation:

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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