1 .	There are two taps Aand Bto fill up a water tank. The tank can be filled in 40 min, if both taps are on. The same tank can be filled in 60 min, if tap Aalone is on. How much time will tap Balone take, to fill up the same tank?
[ A ]    64 min [ B ]    80 min [ C ]    96 min [ D ]    120 min
Answer : Option D Explanation : Work done by tap Bin 1 min =$1\over40$-$1\over60$=$3-2\over120$ = $1\over120$ Total time taken by the tap Bto fill the tank is 120 min.
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