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syllubus of railway exams

a and b can together do a piece of work in 10 days.if a works with twice of his efficiency and works with an efficiency 1/3 less than his efficiency, then the work gets complicated in 6 days,.in how many days can a and b do the work alone respectively?

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In the country of four,there are four cities a,b,c,d.b is to the east of a,c is the south of b,d is to the west of c,& a is the north of d.the government wants to connect four cities by road such that person can go to other four cities also.at the same time minimum length of road.a to b,b to c,c to d,d to a,are equal to 10 know.what should be the minimum length of the road?

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2×2×÷33÷6

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