Multiple choice

In covering a distance of 30 km, A takes 2 hours more than B. If A doubles his speed, then he would take 1 hour less than B. A's speed (in km/hr.) is- 30 किमी. की एक दूरी को तय करने में, A, B से 2 घण्टे अधिक लेता है। यदि A अपनी चाल दोगुनी करता है, तो वह B से 1 घण्टे कम लेता है। A की चाल (किमी./घण्टा) में है-

  1. 5

  2. 6

  3. 6.25

  4. 7.5
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let A's speed = a km/hr. Then B's speed = 30/(30/a - 2) = 30a/(30 - 2a) km/hr. When A doubles speed: 30/(2a) = 30/b - 1. Substituting b and solving gives a = 5 km/hr. Option A matches. Distractor B (6) and C (6.25) are close but incorrect.

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