Answer
8 hours
Work Step by Step
Sandra takes 6 hours to drive 300 miles. This means her speed is:
$300 miles/ 6 hours = 50 miles/hour = 50$ mi/h. If she increases her speed by 5 mi/h, She will be going 55 miles per hour. The amount of time that it will take to go 440 miles is:
$(440 miles) / (55 miles/hour) = 8$ hours
