navodaya Exam Numerical Ability Time and Work

To do certain work B would take three times as long as A and C together and C takes twice as long as A and B together A, B and C together complete the work in 10 days .How long would A alone take to complete the work?

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navodaya Other Question

In a two digit number ,the unit's digit is twice the ten's digit .if 27 is added to the number, the digits interchange their places.the number is A is driving along a highway at a speed of 90 km/hr .He is passed by B who is driving on the same highway in the same direction at a constant speed .Twelve seconds after B passes A ,their cars are 100 m apart.The speed of B's car ,in km/hr,is