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juliannabartra
16.12.2020 •
Mathematics
An item is regularly priced at 55$ . It is now priced at a discount of 60% off the regular price. What is the price now?
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Ответ:
I believe it to be $22
Step-by-step explanation:
Ответ:
Answer
Average speed of the train = 90 km/h and average speed of the airplane = 360 km/h.
Explanation:-
If speed of train = x then the speed of airplane = 4x km/h and we have the 2 equations
x = 1440 / (t + 12) (t = time taken by the train)
4x = 1440 / t(1) (t = time taken by train)
Multiply the first equation by 4:-
4x = 5760 / (t + 12)(2)
Combining equations (1) and (2):-
1440 / t = 5760 / (t + 12)
Cross multiplying:-
5760t = 1440t + 17,280
4320t = 17,280
t = 17280/4320
t = 4 hours
speed of train = 1440/ (4 + 12) = 90 km/h and speed of plane = 4*90 = 360 km/h.