exam Maths Puzzle Numerical Ability

Whats 60 kilometers in 1.5 hours average speed?

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exam Other Question

Coffee drinkers. Among 100 coffee drinkers, 36 said that they preferred their coffee black and the rest did not prefer their coffee black. Find the ratio of those who prefer black coffee to those who prefer non-black coffee Solve the system by the elimination method.
5x + 2y = -7
7x - 3y = 19
What is the solution to the system???
I really do not understand these how to do these? Can someone please help??