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A boy increases his speed to 9/5 times o...

A boy increases his speed to 9/5 times of his original speed. By this he reaches his school 30 minutes before the usual time. How much time does he takes usually?
एक लड़का चाल में वृद्धि करके वास्तविक चाल का 9/5 गुना कर लेता है | इसके कारण वह अपने विद्यालय सामान्य समय से 30 मिनट पहले पहुँच जाता है | उसे आमतौर पर कितना समय लगता है ?

A

a)67.75 min

B

b)67.50 min

C

c)67.25 min

D

d)67.10 min

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