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1) Sheela drove the car at the speed of 3x2 km/hour and covered (15x5y2+11x4z+19x2) \(km\). Find the time taken by Sheela to cover the distance.
 
 
\((\)ixiy2 \(+\) iixiz \(+\) ii\()\) hours.
 
[Note: Insert the suitable coefficient and powers of variables as per the given order and write the constant value in the last answer box.]
 
 
2) Simplify the following:
 
12(2x−16y)6(x−8y) \(=\) .