$90,000l\frac{b}{h}$ of benzene will be heated from $75F$ to $145F$ by cooling a stream of orthotoluidine from $230F$ to $150F.$ Inlet pressures are $45a$ for ortho$-$toluidine and $50a$ for benzene. A maximum pressure drop of $10$ psi is specified for each stream. Properties of ortho$-$toluidine at $190F$ are given below.

$\backslash$table$[[$o$-$Toluidine property,Value at $190F$