Train covers distance 51 km in 45 min 221 km= so we find 1 km=
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In 51 km train covers the distance in 45 min
So,1 km train covers the distance in 45/52
In 221 km train covers the distance in 221×45/52
=195
So,1 km train covers the distance in 45/52
In 221 km train covers the distance in 221×45/52
=195
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