Wile E. Coyote is holding a "Heavy Duty Acme Anvil" on a cliff that is 40m high. The
Roadrunner, who is 1m tall, is running on a road toward the cliff at a constant velocity of
10m/s. Wile E. Coyote wants to drop the anvil on the Roadrunner's head. How far away
should the Roadrunner be when Wile E. drops the anvil?

Please help I don’t understand and I don’t know what to do!