este Acr Trigonoi ordes on SA le d khanacademyorg/mission/sat/exams/d ea7b74d at

Question

este Acr Trigonoi ordes on SA le d khanacademyorg/mission/sat/exams/d ea7b74d ator OK KHAN Ms. Simon's Workday Morning Drive segment of drive Distance Avg. driving speed with (miles) no traffic delay (mph) From home to freeway 25 entrance From freeway 15.4 50 entrance to freeway From freeway exit to Ms. Simon drives her car from her home to her workplace every workday morning. The table above shows the distance, in miles, and her average driving speed, in miles per hour (mph), when there is no traffic delay, for each segment of her drive. a Type here to search

Explanation / Answer

Case 1: If she starts at 6 AM

We know Time = Distance/Speed

So, from home to freeway entrance time taken = 0.6/25 = 0.024 hours or 0.024 * 60 = 1.44 minutes

From freeway entrance to freeway exit time taken = 15.4/50 = 0.308 hours or 0.308 * 60 = 18.48 minutes

From freeway exit to workplace time taken = 1.4/35 = 0.04 hours or 0.04 * 60 = 2.4 minutes

So, total time when she starts at 6 AM = 22.32

Case 2: When she starts at 7 AM:

So, from home to freeway entrance time taken = 0.6/25 = 0.024 hours or 0.024 * 60 = 1.44 minutes

From freeway entrance to freeway exit time taken = 15.4/50 = 0.308 hours or 0.308 * 60 = 18.48 minutes

Now this time increased by 33%, so now time taken is = 18.48 * 1.33 = 24.5784 minutes

From freeway exit to workplace time taken = 1.4/35 = 0.04 hours or 0.04 * 60 = 2.4 minutes

So, total time when she starts at 7 AM = 28.4184

Differemce in time = 28.4184 - 22.32 = 6.0984 minutes

Rounding off it comes to 6 minutes

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