Question

7. The blades of a fan revolve 40 times a minute. How many revolutions will it make in 1 hour 20 minutes ? (1) 2400 (2) 3200 (3) 4000 (4) 4800​

Answer 1

Answer:

2)3200

in 1 hr - 40*60=2400+20*40=800=3200

Step-by-step explanation:

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Answer 2

Answer:

(2)3200

Step-by-step explanation:

blades of a fan revolve 40 times a minute.

blades of a fan revolves in 1hr20min =40*1hr20min

=40*(60+20)min

=40*80 min

=3200min