Ratio problem

intermediate(ipc)course (no) (1460 Points)

15 March 2012  

the ratio between the speeds of two trains is 7:8.if the second train runs 400 kms.in 5 hours,the speed of the first train is

a).10km/hr                                                                                                                                          b).50km/hr

c).71km/hr                                                                                                                                           d).none.