The cunninghams are moving across the country. mr.cunningham leaves 2.5 hours before mrs.cunningham. if he averages 40 mph and she averages 65 mph,how long will it take mrs.cunningham to overtake mr.cunningham?
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Ответ:
When she starts out, he is (40x2.5)= 100 miles ahead of her.
She gains (65-40)= 25 miles on him every hour.
It takes her (100/25)= 4 hours to catch up to him.
Ответ:
A)
Explanation:
Inside your CD player, there is a miniature laser beam called a semiconductor diode laser and a small photoelectric cell an electronic light detector. The laser flashes up onto the shiny side of the CD, bouncing off the pattern of pits and lands on the disc.