Question

1-A man is walking away from a lamppost with a light source h = 4 m above the ground. The man is m = 2 m tall. How long is the man's shadow when he is d = 6 m from the lamppost? [Hint: Use similar triangles.]

2-What amount of a 70% acid solution must be mixed with a 45% solution to produce 200 mL of a 60% solution?

3-Stan and Hilda can mow the lawn in 60 min if they work together. If Hilda works twice as fast as Stan, how long does it take Stan to mow the lawn alone?

4-A pilot flew a jet from City A to City B, a distance of 1500 mi. On the return trip, the average speed was 20% faster than the outbound speed. The round-trip took 3 h 40 min. What was the speed from City A to City B?

Answer 1