book Maths Puzzle Numerical Ability

ollie Carr has just enough money to rent a canoe for 1 1/2 hours. how far out on a lake can he paddle and return on time if he paddles out at 2 km/h and back 4 km/h?

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book Other Question

what is the amplitude, period, phase shift, and vertical displacement for
y= (square root 7)cos[5(x-85 degrees)] - 1.2 In the numbers 1 through 100, which digit appears the most? While you�re at it, in that same set of numbers, which digit appears the least?