self Maths Puzzle

A wheel rotates 3.5 times in one second. What time(in seconds) does the wheel take to rotate 55 radian of angle?

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self Other Question

A and B are centres of the two circles whose radii anre 5cm and 2cm respectively. The direct common tangents to the circles meet AB extended at P. Then P divides AB A train running @ 54kmph takes 20sec to pass a platform. Next it takes 12secs to pass a man walking @ 16kmph in same direction in which the train is going. Find the length of train and that of platform