Question

A spaceship a leaves earth for jupiter at noon on monday travelling at 30,000 km/hr. after 6 hr another spaceship b leaves jupiter for earth travelling at 50,000 km/hr. the distance between jupiter and earth is 9,80,000 km. [assume the spaceships move in straight lines and the planets are stationary with respect to each other.] how much time before a reaches jupiter will b reach earth?

Answer 1

Distance between Earth and Jupiter is 9,80,000 km

The spaceship "A" leaves earth for jupiter at noon on monday travelling at 30,000 km/hr.

Time taken by this spaceship = 980,000/30,000 = 32.67 hours or 32 hours 40 mins

The spaceship "B" leaves jupiter for earth after 6 hours travelling at 50,000 km/hr.

Time taken by another spaceship = 980,000/50,000 = 19.60 hours or 19 hours 36 mins

B will reach earth early by 32 hours 40 mins - 19 hours 36 mins - 6 hours

= 7 hours 4 mins

Thank you :)