book Maths Puzzle Numerical Ability

Pump A can fill a tank in 6 hours. Pump A and B together can fill the same tank in 3.5 hours. How long will it take to pump B to fill the tank alone? Can you show me how to do this problem? Thank you.

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book Other Question

can someone TEACH me how to find a boundry of a line??????(step by step)

for example--- Y>/ x+3

y>/ -x+1 Every man on earth has made a certain number of handshakes.Prove that the number of people who have made an odd number of handshakes is even.