Correct Answer - Option 1 : 6 hrs.
Given:
The driving speed of pooja and Nita are 60 km/h and 90 km/h respectively.
The time taken by Pooja to reach Jodhpur is 9 hrs.
Concept Used:
If the distance covered is constant, the Time taken will be inversely proportional to the Speed.
Calculation:
The ratio of the speed of Pooja and Nita = 60 ∶ 90 = 2 ∶ 3
The ratio of the time taken by Pooja to that taken by Nita will be 3 ∶ 2.
Pooja takes 9 hrs. to travel from Delhi to Jodhpur
3 unit → 9 hrs.
2 unit → (9 × 2)/3 = 6 hrs.
∴ Time taken by Nita to reach Jodhpur is 6 hrs.