Based on the 100-year rainfall records at a certain location in a city, the rainfall intensities with an annual exceedance probability of 0.1 (10-year return period) of different duration are given below. Duration, td (min) 15 30 60 120 Intensity, i (mm/h) 161 132 103 74 a) Determine the coefficients a and c for the following intensity-duration-frequency (IDF) curve using the least-squares method: , in which i

step-by-step explanation:

4x and 6y

im not sure though

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles