Which is faster -20m/s or 20km/h? Show calculations to support your answer
Answers
Answered by
4
Answer:
The difference of the speed of the faster and slower car is 20Kmhr
−1
. If slower car is takes 1 hour more than the faster car to travel a distance of 400Km, find the speed of both the cars.
Let speed fast car be 'x' km/hr
and slow car be 'y' km/hr
given (x−y)=20km/hr
⇒x=(20+y)km/hr
time taken by x to travel 400km=
x
400
time taken by y to travel 400km=
y
400
given (
y
400
)=
x
400
+1
[
y
400
]=
(20+y)
400
+1
1=400[
(20+y)
−1
+
y
1
]
⇒
400
1
=
y(20+y)
(20+y−y)
⇒(20)(400)=y(20+y)
⇒80×100=y(20+y)
⇒y=80km/hr and x=20+y=100km/hr
∴ speed of both cars are 80km/hr and 100km/hr
Explanation:
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Answered by
3
Answer:
20*60=1200mt
1200*60=72000
so 20m/s = 72km/hgreater than 20kmph
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