Question

Mark (✓) against the correct answer:
Rashmi types 510 words in half an hour. How many words would she type in 10 minutes?
(a) 85
(b) 150
(c) 170
(d) 153

Answer 1

(c) 170 words

Let x be the number of words typed by Rashmi in 10 minutes.

No. of words	510	$x$
Time(in min)	30	10

Less time will be taken to type less number of words.
So, it is a case of direct variation.

$$\begin{gathered} \mathrm{Now},\frac{510}{30}=\frac{x}{10} \\ \Rightarrow x=170 \end{gathered}$$

∴ Rashmi will type 170 words in 10 minutes.