This question already has an answer here:
I have 4 DC motors, and I do not need to individually control each of them. Can I connect all the motors parallely to one pair of motor pins on the L293D? Does this pose any issues?
I'm using BO geared motors with the following specs: RPM - 100; Output Torque - 0.8--5kgcm; Operating Voltage - 3v-12v; No-load Current - 57 mA;