Wireless Communication past question

Assume free space propagation, a receiver is located 10 km away from a 50 w transmitter. The carrier frequency is 900 MHz. antenna gain at transmitter and receiver are 1 and 2 respectively, find: i) The power received at the receiver ii) The magnitude of E-field at the receiver antenna iii) The power flux density iv) The rms voltage applied to the receiver input. The receiver antenna has a purely real impedance of 50 Ohm and is matched to the receiver.