Edward and Steven are racing on a circular track. If Edward takes 49 minutes and Steven takes 63 minutes to complete the round. If they both start at the same point at the same time and go in same direction, after how many minutes will they meet again at the start point?
^@ A ^@ and ^@ B ^@ are points on the sides ^@PR^@ and ^@QR ^@ respectively of a ^@\Delta PQR^@ such that ^@ RA = 15\space cm, RP = 60\space cm, RQ = 40\space cm, \text { and } BQ = 30\space cm ^@. Find the relation between ^@ AB ^@ and ^@ PQ. ^@
Two concentric circles are of radii ^@ 5 \space cm ^@ and ^@ r \space cm ^@ ^@ ( r > 5 ) ^@.A chord of the larger circle of length ^@ 50 \space cm ^@, touches the smaller circle. What is the value of ^@ r ^@ ?
A car has two wipers which do not overlap. Each wiper has a blade of length ^@ 28 \space cm ^@ sweeping through an angle of ^@ 120^\circ ^@. Find the total area cleaned at each sweep of the blades.
A solid metallic right circular cone ^@24 \space cm^@ high and whose vertical angle is ^@120^\circ^@ is cut into two parts at the middle point of its height by a plane parallel to the base. If the frustum, so obtained, be drawn into a wire of diameter ^@\dfrac { 1 } { 3 } \space cm^@, find the length of the wire.
From among a group of 5 men, 5 women and 6 children, 2 individuals are selected randomly. What is the probability that exactly 1 among the chosen are children?