### Instruction: a and b can do a piece of work in 10 days , b and c in 5 days , c and a in 15 days . how long will c take to do it ? Let's write a Python program.### Response: n0 = 10.0
n1 = 5.0
n2 = 15.0
t0 = n0 * 3.0
t1 = t0 / n0
t2 = t0 / n1
t3 = t0 / n2
t4 = t1 + t2
t5 = t4 + t3
t6 = t5 / 2.0
t7 = t6 - t1
answer = t0 / t7
print(answer)