How long does it take a 750watt heater operating at full rating to rais the temperature of 1kg of water from 40°c to 70°c {s. h.c=4200j/kg/k and neglecte heat loss}

The path of a satellite orbiting the earth causes it to pass directly over two tracking stations a and b, which are 51 miles apart. when the satellite is on one side of the two stations, the angles of elevation at a and b are measured to be 87 degrees and 84 degrees, respectively. (a) how far is the satellite from station a? (b) how high is the satellite above the ground?