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  1. 35 km/hr
  2. 28 km/hr
  3. 30 km/hr
  4. 20 km/hr
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1 Answers

Option 3 : 30 km/hr

Let the normal speed be x km/hr

⇒ Distance for which the speed is x = 3/4 of 120 = 90 kms

⇒ Distance for which the speed is x/4 = 120 – 90 = 30 kms

⇒ Total time taken = +

If there would have been no trouble then,

⇒ Time taken = 120/x

Delay caused due to trouble is 3hrs

⇒ + – = 3

On solving we get,

⇒ x = 30 km/hr

∴ Normal speed of the vehicle is 30 km/hr

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