exam Maths Puzzle Numerical Ability

If a crew of 8 can row a boat 20k/hr in still water. The river flows 2K/hr. If they row the boat up stream and return in 15min.how far up stream did they go?

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exam Other Question

If you begin with an even integer and count by two, you are counting consecutive even integers. Write and solve an equation to find two consecutive even integers whose sum is 50. perform the matrix row operations and write the new matrix
|2 -4 1 | 4 |
|-5 0 1 | -3 | -3R1+R2
|-1 5 -2 | -1 |