exam Maths Puzzle Numerical Ability

Two ships leave port at the same time. One sails south at 15 mi/h and the other sails east at 20 mi/h. Find the function that models the distance (D) between the ships in terms of the time [(t) in hours] elapsed since their departure.

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exam Other Question

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? 2nd question is same as 1st, factor tree. How do I do and what is the prime factorization of the number.

90
5 x _
_ x _ x 2
_ x _ x _ x _