A small aeroplane can travel at 320 km/hr in still air. The wind is blowing at a constant speed of 40 km/hr. The total time for a journey against the wind is 135 minutes. What will be time, in minutes for the return journey with the wind? (ignore take off and landing time for the aeroplane)
(1) 94.5 (2) 105
(3) 108.125 (4) 120
Answers
Answered by
3
Correct Answer:
B) 105 min.
Description for Correct answer:
According to question, speed of aeroplane against the wind
= (320 - 40)
= 280 km/h
Let the distance be x km.
Then, 13560 = x280
=> x = 630 km
Now, Speed of Aeroplane with the wind
= (320 + 40)
= 360 km / h
∴ Time taken by aeroplane with the wind
= 630360×60 min = 105 min
Similar questions