120hr

120*/*per hour

Usually replies in 58 minutes

Mathematica
| 10+ other subjects

40hr

40*/*per hour

Usually replies in 1 hour

Mathematica
| 10+ other subjects

45hr

45*/*per hour

Usually replies in 52 minutes

Mathematica
| 10+ other subjects

65hr

65*/*per hour

Mathematica
| 10+ other subjects