Aparticular star cluster contains stars all with the same apparent magnitude of +4. near the cluster (and at the same distance from the earth) is a single star with an apparent magnitude of +1. the star's brightness appears to be the same as the collective brightness of the entire cluster.
how many stars are in this cluster?

3,000 stars.

Explanation:

Subtract the magnitude of the single star from the magnitude of the star cluster.

(+4) - (+1) = +3

Then multiply your answer by 1000

= 3,000 is a stars.

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explanation:

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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