Question

Three artificial satellites revolve round the earth in 9, 10,12 days respectively to complete one round. If all the three stared at the same place on first January 2021, on which date all the three will meet at the same place for the first next.​

Answer 1

Answer:

the Soviet Union

Sputnik, any of a series of three artificial Earth satellites, the first of whose launch by the Soviet Union on October 4, 1957, inaugurated the space age. Sputnik 1, the first artificial satellite launched, was a 83.6-kg (184-pound) capsule.