My friend sets out walking at a speed of 3 miles per hour. I set out behind her 5 minutes later at 4 miles per hour.
For how many minutes will my friend have been walking when I catch up to her?
Answers
Answer
Step-by-step explanation:
When you catch up with your friend, your friend and you would have walked the same distance. But you would cover the same distance in 5 minutes less as you started later.
So, Speed= distance/ time
Therefore, Distance= Speed × Time
Let the time taken be x hrs.
Using the above relation,
4 {x-(5/60)} = 3x
4x- 1/3 = 3x
x = 1/3 hrs.
Or x = (1/3) × 60 = 20 minutes.
Therefore, you and your friend will meet in 20 minutes.
Answer:Step-by-step explanation:
When you catch up with your friend, your friend and you would have walked the same distance. But you would cover the same distance in 5 minutes less as you started later.
So, Speed= distance/ time
Therefore, Distance= Speed × Time
Let the time taken be x hrs.
Using the above relation,
4 {x-(5/60)} = 3x
4x- 1/3 = 3x
x = 1/3 hrs.
Or x = (1/3) × 60 = 20 minutes.
Therefore, you and your friend will meet in 20 minutes.
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