A certain number of person can dig a tre...

A certain number of person can dig a trench 100 m long , 50 m broad and 10 m deep in 10 days. The same number of persons can dig another trench 20 m broad and 15 m deep in 30 days. The length of the second trench is `400\ m` b. `800\ m` c. `500\ m` d. `900\ m`

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