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CBSE Class 9 Answered

motion
Asked by fathima12 | 19 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 | 20 Sep, 2009, 11:38: AM
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