#### Answer

Your call to Afghanistan can last 89 minutes.

#### Work Step by Step

We see that the cost per minute to the Philippines is: $\$0.084/minute$. Since you made a 95 minute phone call, the total cost was:
$0.084*95=\$7.98$
Since you started with $\$20$, the amount left is:
$20-7.98=\$12.02$
Thus you can use this amount to call Afghanistan at a rate of $\$0.134$:
$12.02\div 0.134\approx 89.7\approx89$ minutes
(We round down because you do not have enough funds for the last minute.)
Therefore, your call to Afghanistan can last 89 minutes.