exam Maths Puzzle Numerical Ability

Can you show me how to solve this problem Step-By-Step?
A rectangle has a perimeter of 34cm. The length in centimeters of its adjacent sides are consecutive integers. Find the dimensions of the rectangle.

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exam Other Question

can you solve?
A boat moves 7kph in still water. It ravels 45 km upriver and 45 km downriver in a total time of 14 hours. What is the speed of the current?
I am more interested in the work than the answer so please show me step by step.
Thanks
5x+2y=8
2x-3y=7