Respuesta :

Number of minutes in 3/4 of an hour is :

n = 3/4 × 60 = 45 minutes.

Now, If it continues to rain at that rate for 15 more minutes :

So, time taken = 45 + 15 min = 1 hour.

Let, rain gauge is filled x fraction in 1 hour.

So,

Hence, this is the required solution.