Want to get to the top? Keep trying! During a 980 miles cruise, a ship travelled 590 miles in 7 hours
first. Then the ship changed its speed for the rest of the trip. If
13 hours were spent on the whole cruise, what was the speed
for the rest of the trip?

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current

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