Yes, 3/5 and 0.6 are equivalent. You can find this out by changing 3/5 to 6/10, because 0.6 is equal to 6/10. It is easy to remember this because the digit 6 is in the tenths place, so it is equal to 6/10.
0.6 = 6/10 Because 6 is in the tenths place, it is 6 out of 10
6/10 = 6/10 The numbers are equivalent
Hope this helps!