Example question:
1. Anna and John both drive to their new home 400 miles away.
Anna drives the family car at an average speed of 60 mph. John
drives the removal truck at an average speed of 50 mph. During
the journey, Anna stops for a total of 1 hour and 20 minutes, John
stops for half as long. What is the difference in minutes between
their arrival times?
A) 60
B) 55
C) 40
D) 90
Answers
Given : Anna and John both drive to their new home 400 miles away.
Anna drives the family car at an average speed of 60 mph.
John drives the removal truck at an average speed of 50 mph.
During the journey, Anna stops for a total of 1 hour and 20 minutes,
John stops for half as long as Anna
To Find : What is the difference in minutes between their arrival times?
A) 60
B) 55
C) 40
D) 90
Solution:
Distance = Speed * Time
1 hr = 60 Mins
Distance = 400 miles
Anna Speed = 60 mph
Time taken = 400/60 hr
= 400 mins
Anna stops for a total of 1 hour and 20 minutes = 60 + 20 = 80 Mins
Total time taken by Anna = 400 + 80 = 480 Mins
Joha Speed = 50 mph
Time taken = 400/50 hr
= 8 hr
= 480 mins
John stops for = 80/2 = 40 Mins
Total time taken by John = 480 + 40 = 520 Mins
difference in minutes between their arrival times = 520 - 480 = 40 mins
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