exam Maths Puzzle Numerical Ability

During the first 4 hours of a trip, you average 40MPH. How long must you travel at 60MPH to finish with an overall average speed of 55MPH?

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exam Other Question
Are lines L1 through points (-3,2) and (0,4) and L2 through points (2,3) and (5,1) perpendicular? (3st)2nd power u-4power,divided by s-1 power t 2power u 7power