exam Maths Puzzle Numerical Ability

Tina can run 12 mi in the same time it takes her to bicycle
72 mi. If her bicycling rate is 20 mi/h faster than her running rate, find each
rate.

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exam Other Question

is 42 the right answer for this?

Find the GCF for 14 and 21?
The current in a stream moves at a speed of 3mph. A boat travels 45 miles upstream and 45 miles downstream in a total time of 8 hours. What is the speed of the boat in still water?

Any help would be greatly appreciated on this!