Question

A heater uses 3 units of electricity in 40 minutes . how many units does it use in 2 hours?

Answer 1

Answer:

2 hours = 120 mins

Electricity used by a heater in 40 mins = 3

Electricity used by a heater in 1 min = 3/40

Electricity used by a heater in 120 mins = 3/40×120 = 9 units

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