After 60 litres of petrol was poured into an empty storage tank, it was still 10% empty. How much petrol (in litres, rounded off to two decimal place) must be poured into the storage tank in order to fill it?
A67.67
B65.67
C61
D66.67
A67.67
B65.67
C61
D66.67
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A can do th of a work in 4 days and B can do th of the same work in 5 days. In how many days they can finish the work, if they work together?