The mean distance of the earth from the sun is `1.496xx10^8`km and it's siderel Revolution period 365.3 days. The siderel Revolution period of the earth's two neighbouring planets Venus and Mars are respectively 224.7 days and 687.0 days, where a day means a terrestrial day. Find the distance of these planets from the sun. neglect the effect of other planets when considering the motion of the planets around sun.