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A train without stoppage travel with an average speed of 50 km/h and with stoppage, it travels with an average speed of 40 km/h. For how many minutes does the train stop on an average per hour?
बिना रुके हुए कोई ट्रेन 50 किमी/घंटा की औसत चाल से चलती है तथा रुक-रुक कर यह 40 किमी/घंटा की औसत चाल से चलती है | हर घंटे यह ट्रेन औसतन कितने मिनट रूकती है ?

A

12

B

13

C

14

D

15

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