a) 7 hours 30 minutes
b) 8 hours
c) 8 hours 15 minutes
d) 8 hours 25 minutes
Answer: c
Explanation:
$$\eqalign{
& {\text{Number}}\,{\text{of}}\,{\text{pages}}\,{\text{typed}}\,{\text{by}}\,{\text{Ravi}}\,{\text{in}}\,{\text{1}}\,{\text{hour}} = \cr
& \frac{{32}}{6} = \frac{{16}}{3} \cr
& {\text{Number}}\,{\text{of}}\,{\text{pages}}\,{\text{typed}}\,{\text{by}}\,{\text{Kumar}}\,{\text{in}}\,{\text{1}}\,{\text{hour}} = \cr
& \frac{{40}}{5} = 8 \cr
& {\text{Number}}\,{\text{of}}\,{\text{pages}}\,{\text{typed}}\,{\text{by}}\,{\text{both}}\,{\text{in}}\,{\text{1}}\,{\text{hour}} = \cr
& {\frac{{16}}{3} + 8} = \frac{{40}}{3} \cr
& {\text{Time}}\,{\text{taken}}\,{\text{by}}\,{\text{both}}\,{\text{to}}\,{\text{type}}\,{\text{110}}\,{\text{pages}} \cr
& = {110 \times \frac{3}{{40}}} {\text{hours}} \cr
& = 8\frac{1}{4}\,{\text{hours}}\,{\text{or}}\,{\text{8}}\,{\text{hours}}\,{\text{15}}\,{\text{minutes}} \cr} $$
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