exam Maths Puzzle Numerical Ability

find the shortest distance between the parallel lines with equations 5x-12y+33=0 and 5x-12y-6=0

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exam Other Question

Triangle PQR has vertices P(asqrt3,bsqrt3), Q(a/2sqrt3,3bsqrt3), R(0,5bsqrt3).
Prove triangle PQR is isosceles. In a race , Mary is 50 ft. in front of Susie after 10 seconds. How fast can Mary run if Susie runs 20 ft per second?