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grayammip095l9
06.03.2020 •
Mathematics
A car travels 90 miles in the same amount of time that a car traveling 10 mph slower travels 60 miles. find the speed of each car
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Ответ:
Speed of the first car is 30 mph and that of the second car is 20 mph.
Step-by-step explanation:
Step 1: Let the speed of the first car be x mph. Then the speed of the second car = x - 10 mph. Distance traveled by the second car = 60 miles. Find the time taken by the second car to travel this distance.Time = Distance/Speed
= 60/x - 10 (1)
Step 2: Find the time taken by the first car to travel given distance of 90 miles.Time = 90/x (2)
Step 3: Given that both cars take the same amount of time, equate the 2 equations. (1) = (2)⇒ 60/x - 10 = 90/x
⇒ 60x = 90(x-10)
⇒ 2x = 3(x - 10)
⇒ 2x = 3x - 30
⇒ -x = -30
∴ x = 30 mph
⇒ x - 10 = 30 - 10 = 20 mph
Ответ:
side bisecter
How?
See the figure
PQ|RSRQ=SQ=7cmHence Q is the midpoint if RS so PQ is a side bisector .