book Maths Puzzle Numerical Ability

HOw many distinct prime numbers are factors of 70?

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book Other Question

f(x)= 2x^4-9x^3+13x^2-81x-45
List Zero Combinations (Real and Imaginary)
Extreme Right and Left Behavior
Lower Bound (Greatest Negative Interger)
Consecutive Interger Interva I need some help on this problem.

A virus scanning program is checking every file for viruses. It has completed checking 40% of the files in 300 seconds. How long should it take to check all the files?

Thanks,
Sher