book Maths Puzzle Numerical Ability

During a kayak race, a paddler can travel a distance of 400 m in 70 seconds. Calculate the average speed of the paddler in a) m/sec and b) Km/hr.

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book Other Question

please help me find all the roots of the equation: x^7-2=0 If a triangular prism and a triangular pyramid have equal bases and equal altitudes, the volume of the prism is how many times the volume of the pyramid?