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Q.

Rita types 40 words per minute and 24 minutes to type a certain document. Her friend Geeta has a typing speed of 48 words per minute. In how much time, will she be able to type the same document?


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a

10 mins

b

15 mins

c

20 mins

d

21 mins 

answer is C.

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Detailed Solution

Concep- This is a straightforward mathematical query. We must first figure out how many words Rita typed in total. Then, using simple techniques, we will compute the words Rita typed while Geeta was taking a photo. Thus, it is simple to calculate how long Geeta spent.
As given in the question Rita can type 48 words in 1 minute.
So, Rita can type total words in the time of 24 minutes will be, =24×40   words.
=960   words.
Thus Rita can type a total of 960 words. So, that document has 960 words.
Now, the time taken by Geeta to type the same document having 960 words is t   minutes and her speed is 48 words per minute.
⇒48×t=960  
We will simplify the above expression, dividing 960 by 48 , as follows
t= 960 48  
⇒t=20  
∴   The time required by Geeta to type the same document will be 20 minutes.
Hence, the correct answer is option 3.
 
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