If sleeper density is M + 7 for 13 m rails, the minimum depth of ballast under wooden sleepers (25 cm x 13 cm), is ?->(Show Answer!)

1. If sleeper density is M + 7 for 13 m rails, the minimum depth of ballast under wooden sleepers (25 cm x 13 cm), is

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MCQ->If sleeper density is M + 7 for 13 m rails, the minimum depth of ballast under wooden sleepers (25 cm x 13 cm), is....

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