exam Maths Puzzle Numerical Ability

May I have some help evaluating this expression?

Evaluate the expression and write the result in the form a + bi.

sqrt(1/5) sqrt(-125

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exam Other Question

6 is what % of 50 A boat travels 1 km upstream and 1km back. The time for the round trip is 10 hours. The speed of the stream is 2 km/hr. What is the speed of the boat in still water?