I would say photosynthesis but the question is a bit dull
Answer:

Explanation:
It is given that,
Voltage of the battery, V = 1.5 V
Internal resistance of battery 1, 
Internal resistance of battery 2,
Current flowing in the lamp, 
Total internal resistance of tow batteries,


Let R is the resistance of the bulb. Let V is the total emf of the circuit. It is given by :




So, the resistance of the bulb is 4.54 ohms. Hence, this is the required solution.
Answer:
40M/S
Explanation:
BY CALCULATION USING THE FORMULA S=FD