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A takes 2 hours more than B to cover a d...

A takes 2 hours more than B to cover a distance of 40km. If A doubles his speed he takes `1 1/2` hours more than B to cover 80 km. To cover a distance of 90 km, how much time will B take travelling at his speed?
A को 40 किमी की दूरी तय करने में B से 2 घंटे अधिक लगते हैं। यदि A अपनी चाल को दोगुना कर देता है तो उसे 80 किमी की दूरी तय करने में B से `1 1/2` घंटे अधिक लगते हैं। 90 किमी की दूरी तय करने के लिए, B को अपनी चाल से यात्रा करने में कितना समय लगेगा ?

A

`1(1)/(8)`hours

B

`1(3)/(8)`hours

C

`1(1)/(6)`hours

D

`1(1)/(3)`hours

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