math
posted by wa
Anna starts the race 10m ahead of ping.ping runs at 20%faster tan anna`s speed.they will be level in the race after 9seconds.find average speed of anna

Steve
if anna's speed is s, then since distance = speed*time,
9s = 9(1.2s)10
9s = 10.8s  10
1.8s = 10
s = 5.55 m/s
Respond to this Question
Similar Questions

spanish
I'm trying to say: at the party, Anna and her father argued about Annas behavior.. so far I have: A la fiesta, Anna y su padre rineron acerca de la conducta de Anna. but A, the first word, is wrong and so is the verb ending..? 
Math/Probability
Anna and bob play a game in which Anna begins by rolling a fair dice, after which bob tosses a fair coin. They take turns until one of them wins. Anna wins when she rolls a 6. Bob wins when the coin lands on heads. What is the probability … 
Math
Anna and bob play a game in which Anna begins by rolling a fair dice, after which bob tosses a fair coin. They take turns until one of them wins. Anna wins when she rolls a 6. Bob wins when the coin lands on heads. What is the probability … 
math
Anna and Jamie were at track practive. The track is 2/5 kilometers around. Anna ran 1 lap in 2 minutes. How many minutes does it take Anna to run one kilometer? 
Physics
Bob and Bob Jr. stand at open doorways at opposite ends of an airplane hangar 25 m long. Anna owns a spaceship, 40 m long as it sits on the runway. Anna takes off in her spaceship, then swoops through the hangar at constant velocity. … 
reading comprehension
Anna has two aunts, Gertie and Samantha. She has one Uncle, jimbo. Jimbo has a nephew on Anna's side of the family, Timothy, who has two children, John and Aubrey. Which of the following indicates the relationship between Timothy's … 
Math
Laurie and Anna are running a 3 mile race. After 5 minutes, Laurie has run 3/5 miles and Anna has run 7/10 mile. If both ladies can keep their same pace for the remainder of the race, how many minutes ahead of Laurie will Anna cross … 
ENGLISH
Anna has two aunts, Gertie and Samantha, and one uncle, Jimbo. Jimbo has a nephew on Anna's side of the family, Timothy, who has two children, John and Aubrey. Which of the following indicates the relationship between Timothy's daughter … 
Math
In a 5 km race, Anna swims 450 m, then runs 800 m. She then cycles the rest of the race. How many kilometres does she cycle? 
math algebra
Gray Glaze requires 15 hours to put a new roof on a house. His apprentice, Anna Gandy, can record the house by herself in 20 hours. After working alone on a roof for 6 hours, Gary leaves for another job. Anna takes over and completes …