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

Solve the following equation for x.

185.45=32.1e^1.23x Can anyone give me a hand with this one? Thanks

Solve the equation. If answer is not exact,givethe answer to four decimal places.

27^x+1 = 3^2x+1

Thanks for your assistance.