Question

Which is faster -20m/s or 20km/h? Show calculations to support your answer

Answer 1

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:

Please mark as brainest

Answer 2

Answer:

20*60=1200mt

1200*60=72000

so 20m/s = 72km/hgreater than 20kmph