rkiran9 wrote:Two secrarties,Sally and lisa,type at even but diffrence paces.Sally is more expeienced and types 80 characters per minute.Lisa a beginner can type only 30 char per minute.On one day,Lisa starts typing before sally.At somepoint both have typed the same number of characters.Then both continue typing and sally types 800 more characters until her computer breaks down.Assuming Lisa does not take any break,How long in hours,Will it take her to finish typing the same number of characters?
a)53/180
b)4/9
c)13/18
d)15/23
e)5/18
Sally:
At some point both have typed the same number of characters.
Sally types 800 more characters until her computer breaks down
Time for Sally to type 800 characters = w/r = 800/80 = 10 minutes.
Lisa:
At some point both have typed the same number of characters.
Then BOTH continue typing.
In the 10 minutes taken by Sally to type 800 characters, the number of characters typed by Lisa = r*t = 30*10 = 300.
Remaining characters to be typed by Lisa = 800-300 = 500 characters.
Time for Lisa to type the 500 remaining characters = w/r = 500/30 = 50/3 minutes.
To convert minutes to hours, we multiply by 1/60:
(50/3)(1/60) = 5/18 hours.
The correct answer is
E.
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