M4maths Maths Puzzle Numerical Ability LCM and HCF

tan^-1(sec x+tan x)

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M4maths Other Question

Four wheels moving 12, 24, 20 and 30 revolutions in a minute starting at a certain point on the circumference downwards. After what interval of time will they come together again in the same position ? speed of a boat in upstream motion is 75 per cent of its speed in downstream motion. If the boat travels 8 km in downstream and 10 km upstream in 5 hour 20 minutes. how much time will take the same boat take to travel 10 km downstream and 8 km upstream?