a) 25 minutes 30 seconds
b) 30 minutes
c) 35 minutes
d) 45 minutes
Answer: b
Explanation: Baggage delivered by first belt in 1 minute
$$ = \left( {\frac{3}{5}} \right){\text{tons}}$$
Baggage delivered by second belt in 1 minute
$$ = \left( {\frac{1}{2}} \right){\text{tons}}$$
Baggage delivered by both belt in 1 minute
$$\eqalign{
& = \left( {\frac{3}{5} + \frac{1}{2}} \right){\text{tons}} \cr
& = \frac{{11}}{{10}}{\text{ tons}} \cr
& {\text{Required time}} \cr
& = \left( {33 \div \frac{{11}}{{10}}} \right){\text{ minutes}} \cr
& = \left( {33 \times \frac{{10}}{{11}}} \right){\text{minutes}} \cr
& = {\text{30 minutes}} \cr} $$
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