Question

a spin driver spins at the rate of 600 revolution per minute. how many revolution would it make in 1min 20 sec​

Answer 1

Answer:

800

Explanation:

per minute it does 600 revolutions

then per 1 sec revolutions =600/60

=10

Then per 80 sec =?

10× 80=800

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Answer 2

Answer:

Hence, the spin driver will make = 1067 revolutions.

Explanation:

Rate of spinning of spin driver = 600 revolutions per minute

Time given = 1 min 20 sec

We know that,

1 sec = 1/60 min

Then, time = 1 min + 20/60 min = 1 min + 1/3 min = (3 + 1) / 3 = 4/3 min

Since, this question deals with similar properties. Its better to use Unitary Method. By using unitary method, we get,

➡ Number of revolutions in 1 min = 600

➡ Number of revolutions in 4/3 min = 800 × 4/3 = 3200 / 3 = 1066.667

➡ Since, number of revolutions cannot be decimal. Then,

➡ 1066.667 ~ 1067 (by rounding off)

Hence, the spin driver will make = 1067 revolutions.