A car travelling at a speed of 80 km per hour can complete a journey in 9 hours. How long will it take to travel the same distance at 60 km per hour?

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  1.  10 hours 
  2.  8 hours 
  3. 12 hours
  4. 16 hours

Answer (Detailed Solution Below)

Option 3 : 12 hours
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Detailed Solution

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Given:

Speed of the car = 80 km/hr

Time taken to complete the journey = 9 hours

Speed of the car for the same distance = 60 km/hr

Formula Used:

Distance = Speed × Time

Time = Distance / Speed

Calculation:

Distance travelled = 80 km/hr × 9 hrs

Distance travelled = 720 km

Time required to travel 720 km at 60 km/hr

⇒ Time = 720 km / 60 km/hr

⇒ Time = 12 hours

The correct answer is option 3.

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