exam Maths Puzzle Numerical Ability

A boat travels 45 mi upstream (against the current) in 5h. the boat travels the same distance downstream 3 h. what is the rate of the boat in still water? what is the rate of the current?

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exam Other Question

f=f1f2/f1+f2 solve for f1 The amount of a radioactive tracer remaining after t days is given
by A = A0 e-0.058t, where A0 is the starting amount at the beginning of
the time period. How many days will it take for one half of the
original amount to decay?