motion

Asked by fathima12 | 19th Sep, 2009, 04:02: PM

Expert Answer:

Average speed = total distance / total time = 400 / 90 = (40 / 9) km/hr

Required ratio = 90 x 9 / 40 = 81 : 4

Answered by  | 20th Sep, 2009, 11:38: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.