Sound travels at 340 meters per second in air.

(a) Find the distance traveled by sound in air in 7 seconds. Give your answer in kilometers.

In 7 seconds, sound travels ? kilometers.

(b) A boy clapped his hands near a cliff. He could hear the echo of his claps 3 seconds later. Find his distance from the cliff. (Remember an echo has to travel the entire distance and then back so you will need to divide by 2 before you give your final answer).

The boy is ? meters from the cliff.