+328 A. Two trains are currently 4 miles apart travelling in opposite direction on adjacenttrain tracks. The east-bound train is going at a speed of 25 miles per hour. Thewest-bound train goes at more than twice the speed at 55 miles per hour. They will meet in how many seconds?
B. The very bored Cindy made the following observation on a very noisy summer night— a cicada was buzzing once every half a second, a cricket was chirping once every 2 seconds, a frog was croaking once every 7 seconds, and the house cat meowed every 10 seconds.The four animals just made a “symphony chant” — buzzing, chirping, croaking, and meowing at the same time. In how many seconds will the next symphony chant happen?
C. William walked to school in the morning at a brisk pace of 8 km per hour. After school, he walked home in a more leisurely pace of 4 km per hour. His total walkingtime was 27 minutes. How far is school in km? Please express the answer in decimal form.
D. Hiro the chef on average can make 6 pieces of sushi every 150 seconds, but he’ll eat 2 every 3 minutes. He did this continuously from11:00 am to 1:30 pm at the same rate. How many sushi did he make (that he didn’t eat)?
from 1100 to 130 is 150 minutes = 9000 seconds
9000 s / 150 s * 6 - 9000 s / 180s * 2 = 260 leftovers
