Question

Emily leaves her house at exactly 8:25 am to bike to her school, which is 3.42 miles away. when she passes the post office, which is 3/4 mile away from her home, she looks at her watch and sees that it is 30 seconds past 8:29 am. If emily's school starts at 8:50 am can emily make it on time without increasing her rate of speed? show and/or explain the work necessary to support your answer.

Answer 1

The speed of Emily is assumed to be constant and is calculated by dividing the distance she traveled from her home to the post office by the time.
speed = (0.75 mile) / (4.5 minutes) = 1/6 miles/minute
Then, calculate the time it will take her to travel from home to school.
time = (3.42 miles) / (1/6 miles/minute) = 20.52 minutes
Adding this to 8:25 will give us an answer of 8:45:31 am. Thus, she will not be late.