Math7 - Rates.pdf

# It takes 1 hen 5 days to hatch 1 egg therefore it

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It takes 1 hen 5 days to hatch 1 egg. Therefore, it would take 1 hen 500 days to hatch 100 eggs. But because we have 100 hens, the 100 hens can hatch the 100 eggs in 500 ÷ 100 = 5 days. If sound travels at 1000 ft/s, after 3 s the sound should have traveled 3000 ft so the lightning is about 3000 ft away. !333 "333 = ! " so the lightning is about ! " mile away.

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C2. Two runners start on opposite ends of a circular track and begin running in opposite directions (towards each other). The distance around the track is 400 meters. If the first runner runs at a speed of 4 m/s and the second runner runs at a speed of 6 m/s how many times will they pass each other in 2 minutes? Answer: C3. Keller and Leon are parked back-to-back on the same circular, 120-meter racetrack. Flags are placed every 10 meters along the track, and labelled from 0 to 11. They start driving at the flag labelled 0 at the same time in opposite directions. If Keller races at a constant speed of 10 m/s in the direction of increasing flag numbers and Leon races at a constant speed of 20 m/s in the opposite direction, at which flag will they collide?

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