In a flight of 600 km a fighter jet was slowed down due to bad weather Its average speed for the tri...........

Quantitative Aptitude (CDS) Time & distance

In a flight of 600 km, a fighter jet was slowed down due to bad weather. Its average speed for the trip was reduced by 150 km/h and the time of flight increased by 40 minutes. The duration of the flight is?

900/7 km /h

1100/7 km/h

760/5 km/h

1200/11 km/h

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Explanation:

let speed is v km/h
distance is 600 km
time =600/v
t=600/v ... equation1
slow down speed is 150 km/h
increased time =40/60 =4/6 hour
time travelled in slow speed +increased time =time in normal speed
600/150 +4/6 =600/v
4 +4/6 =600/v
600/v =28/6
v=3600/28 km /h
=900/7 km/h