The time that it will take her to get to school if she goes 40miles/hour is 6.75 minutes
From the information, it was stated that Heidi uses 10 minutes to get to school going at a speed of 27 miles/hour.
The distance to the school will be:
= 27 × (10/60)
= 4.5 miles
The time taken will be:
= distance/velocity
= 4.5/40
= 6.75 minutes
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