A bus starts with a speed 15 metre per second then how much time does it take to complete 15 km pls pls help

First, you can convert 15 km to metres, which would be 15000 metres

then, divide 15000 metres by 15 metres per second to find the time: 15000/15 = 1000 seconds

final 1000 seconds

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.