I'm stuck on this: computer network

Calculate the bandwidth- delay product for the following links. Use one-way delay, and the only delay is speed-of-light (3 times 10 m/s) propagation delay. (a) 2 Gbps Ethernet with a delay of 12 mu s. (b) 1.5-Mbps T_1 link, with a delay of 6 ms. (c) 10 Mbps link through a satellite in geosynchronous orbit, 35, 900 km high