Question

54km/hr is equal to _____m/s.
a) 12 b) 15
d) 20
c) 25​

Answer 1

Answer:

⤵⤵⤵

1 km/hr =5/18 m/s

So, 54 km/hr = 5/18×54

======> 15 m/s

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Answer 2

Answer:

Step-by-step explanation:A Traveler starts from A towards B at 7:00 a.m. and another Traveler starts at the same time from B towards A

Let say Distance  between A & B =  D km

They meet at 9:00 a.m. at 36 kilometer from A

=> Distance Travelled by A  = 36 km

& Distance Travelled by B = D - 36 km

Time taken = 2  hrs

Speed of A = 36/2 = 18 km/hr

Speed of B = (D-36)/2  km/Hr

further Time taken by B  to reach A

= 36/ ((D-36)/2)

= 72/(D - 36) hr

Distance covered by A in this time

= 18 *  72/(D - 36)

18 *  72/(D - 36) = D - 36 - 36   (  36 km Already covered & 36 km still to reach B)

=> 18*72  = (D-72)((D - 36)

=> D² -108D + 36*72 - 18*72 = 0

=> D² - 108D + 18*72 = 0

=> D =  (108 ± √((108)² - 4*18*72))/2

=> D = 94.25  km    ignoring value < 36 km

Distance between A & B = 94.25 km