A man runs round a circular field of radius 50m at the speed of 12 km/hr. What is the time taken by the man to take twenty rounds of the field?
speed = 12 km/h = 12×518=103m/s
distance covered = 20×2×227×50=440007m
time taken = distance /speed = 440007×310sec=4400×37×160min=2207min
The lengths of the diagonals of a rhombus are 16 cm and 12 cm. Its area is:
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