exam Maths Puzzle Numerical Ability

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?

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exam Other Question

find the shortest distance between the parallel lines with equations 5x-12y+33=0 and 5x-12y-6=0 How do I solve by using two equations in two variables?

Larry is 8 years older than his sister. In 3 years, he will be twice as old as she is now. How old are they now?