Do a proportion
60/100= x/300
60 x 300= 18,000
18,000 divided by 100= 180
Answer is 180
Or you could have done .60 x 300 and got 180.
1 km 125m = 1125 meter on Monday
1125-375=750 meter on Tuesday
The answer to that would just be 18 if you want the word in number form, I'm actually kinda confused on what your question means
If:
a + (-0.4) = -3
a = -3 - (-0.4) = -3 + 0.4 = -2.6