A beam ABCD with simple supports at A, B and D and an internal hinge at C is subjected to loads as shown in figure. The reaction at middle support B is given by 2m 20kN * (a) 7.5 kN (c) 20 kN 2m B ** 1m C * 1m 20kN D Im * + (b) 10 kN (d) 22.5 kN