70.75
nowhere!
0.0071
56.6
0.0106
You didn't mention whether we're allowed to repeat (re-use) a digit.Here are the smallest 5 primes using only those digits:With repeated digit: 223, 233, 277With no repeated digit: 257, 283
283 x 1 = 283
0.0071
7.075
56.6
0.0177
0.0106
257.2727
70.75
0.0777
283 Divided by 70 = 4.04 (hours)
79.3333
56.6
Hey mate what is your 7 digit casting number??????????????