Answer:
5 hours 12 seconds
Step-by-step explanation:
For the entire train to pass the person, the head of the lead wagon must travel (9·16 m) in 12 seconds. It is traveling at a speed of ...
(9·16 m)/(12 s) = (144/12) m/s = 12 m/s
For the train to travel 216 km + 144 m = 216,144 m will take ...
(216,144 m)/(12 m/s) = 18,012 s = 5 hours 12 seconds
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<em>Comment on the speed</em>
The speed of this "wagon train" is about 26.8 miles per hour, faster than any human and most animals can run for long periods. The Pony Express cross-country mail delivery service maybe set a reasonable standard for cross-country travel. Its average speed was about 10 miles per hour.
Answer:
Step-by-step explanation:
18 min = 0.3 h
Car 1 started 0.3 h before Car 2.
Let t = time of Car 2. Then
t + 0.3 = time of Car 1
Distance = speed × time, and both cars travel the same distance. Then
Check:
OK.
Answer:
scale factor = ratio of corresponding side= 0p/xy = 4/10= 2/5
∠x = 58
∠y= 180-49-58= 73
Step-by-step explanation:
Answer:
3
Step-by-step explanation: you would use PEMDAS parenthesis, exponents, multiply, division, add, subtract. First you multiply 3 times 2 and get 6 plus 5 is 11 lastly you minus 11 with 8 and get 3