exam Maths Puzzle Numerical Ability

what is the distance 6.5 miles traveling at 5mph?

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exam Other Question

As light penetrates a body of water , its intensity"I" measured in candela/cm^2 decreases exponentially. For one particular pond it is known that the light intensity at the surface If
(2x+1)(x-5)
--------- = 0,then x=
x+3