a) 4 minutes
b) 6 minutes
c) 10 minitus
d) None of above
Answer: b
Explanation: Number of units processed by computer A in 1 minute
$$ = \frac{1}{3}$$
Number of units processed by computer B in 1 minute
$$ = \frac{1}{5}{\text{ }}$$
Number of units processed by computer A, B and C in 1 minute
$$\eqalign{
& = \frac{{14 \times 3}}{{60}} \cr
& {\text{ = }}\frac{7}{{10}} \cr} $$
Number of units processed by computer C in 1 minute
$$\eqalign{
& = \frac{7}{{10}} – \left( {\frac{1}{3} + \frac{1}{5}} \right) \cr
& = \frac{7}{{10}} – \frac{8}{{15}} \cr
& = \frac{5}{{30}} \cr
& = \frac{1}{6} \cr} $$
Computer C takes 6 minutes to process one input alone.
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