exam Maths Puzzle Numerical Ability

multiply:

-3a^2b 14a^3b^2
------ * ---------
35a^5 -9b^4

If this was simpler I could figure it out, but with so many letters in it I have just become lost! Thank you for the help!!!!

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exam Other Question

9+x=16 a train travels due north at 65 km/h. Six hours later, another train leaves the same station travelling due north on a parallel track, and travels at 95 km/h. In how many hours will the second train overtake the first?