self Maths Puzzle

6/2(1+2) = ?

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self Other Question

one pipe fills d tank in 3hrs & another pipe empty d tank in hrs4.30.how much time required to fill d tank if both pipes working at a time Two trains are opposite to each other , bird is on one train . Speed of both trains are 25km/hr & 50 km apart . When trains starts(against each other) , bird also start flying from one train to other , till they clash. Speed of bird is 100km/hr . Distance travelled by bird till trains clash. ?