Question 155457
Let the rate of rainfall for the 1st rain be x ml/hr and for the 2nd rain be y ml/hr.

Volume of rain during first storm=x*15
Volume of rain during second storm=y*25

Total volume=1250ml
1250 =15x + 25y



Sum of two rates=60
x + y=60
x    =60 - y

Substitute the value of x in the first equation:

1250=15(60-y) +25y
1250=900-15y+25y
350 =10y
y =35
x=60-35=25