Can you help me answer number 10?

10. Kirk saw the space shuttle take off from its launch pad. He heard the ignition blast 15 seconds later. The frequency of the sound wave produced by the engine blast was 2000 Hz. Assume the speed of sound on that day was 340 meters per second. (a) Find the distance in kilometers that Kirk was from the launch pad. (b) What was the wavelength in meters of the sound wave produced by the engine blast