Let's see who can answer first What's the combination? I'll give you a clue. It starts with a fraction with the denominator of 2. You'll need to simplify once again Because the numerator in this fraction is 10. What is the answer?

5

Step-by-step explanation:

Referring to the clue given, the denominator of the fraction is 2 and the numerator of the fraction is 10.

So, the fractional number is

 [ prime factorization of 10 = 2 x 5]

On canceling the common factor of numerator and denominator, i.e 2, we have  

Hence, the required value is 5.

sine

step-by-step explanation:

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m