Algebra Help … plz! Thanks!?

7: Noah left Miami and went to a speed of 40 miles per hour. Zachary left 3 hours later from the same point, and drove at a speed of 60 kilometers per hour. How long does it take to catch up with Zachary Noah? 9 hours 6 hours 12 hours 15 hours 8: Aaron left New York and led to a speed of 50 mph. Kayla left 2 hours later from the same point, and drove at a speed of 69 mph. How long does it take Kayla to catch Aaron? 7.26 minutes 5.26 hours 15 minutes 7.26 hours 9: Hunter and Jonathan left Seattle at one in the afternoon, travel in opposite directions. At six o'clock, which were four hundred forty kilometers away. If Jonathan speed rate is three times higher than the Hunter, which is the speed Jonathan? 43 km / h 53 km / h 61 km / h 66 km / h 10 Alexandra lives thirty-three miles of work. During the summer, rides his bike at seven miles per hour at the station underground. After 3 miles 4 miles 6 miles 8 miles

# 7. The key is knowing who come to the same position after X hours. X = NOAH time and Zack were traveling together. By Therefore, Noah was an advantage 3 hours @ 40 K / H => 40 km / hr x 3 hours = 120 Head Start km. The total distance of Noah, then, 120 (distance traveled before Zack left) + 40 (x) (distance traveled after Zack left). This = distance traveled by ZAC (60x) 120 + 40x = 60x is the equation. thus 120 = 20x -> x = 6 hours from the point after leaving Zac # 8 is the same way equation is 100 + 50x = 69x -> x = 5.26 hours # 9 R = D / T. Distance T = 440 km = 5 hours A: J = rate of John, .. H = rate of hunter you know that J = 3H or H = J / 3 R = D / T – +> (JJ / 3) = 440 / 5 -> 4 J = 264 -> J = 66

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