[" 77.A train "1" moves from east to west and another train,"],[" moves from west to east on the equator with equal "],[" speeds relative to ground.The ratio of their centripect "],[" accelerations "(a_(1))/(a_(2))" relative to centre of earth is: "],[[" (a) ">1," (b) "=1],[" (c) "<1," (d) ">=1]]