A space probe is sent to pass close to the planet jupiter. suppose that when the probe reaches jupiter, the planet is 630 million kilometers away from earth. how long will it take for the radio signals from the probe to teach us?

Radio waves (similar to electromagnetic radiation) travel at the same speed of light, that is 300,000 km/second.

Jupiter being at 630,000,000 km from earth, the time needed to get the radio waves on earth = 630,000,000/300,000 = 2,100 sec or 35 minutes