The speed of a train is 110 km/h. It is increased by 20% and then runs at uniform speed. The train driver sees the 'Slow Down' sign, so he reduces the speed of the train by 40% of the speed at the moment. What is the final speed (in km/hour correct to one decimal place) of the train?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 79.2.
Given:
The speed of a train is 110 km/h
Calculations:
First the speed of train is increased by 20%
New speed = 110 × 120/100 = 132 km/h
Now, the speed is decreased by 40%
New speed = 132 × 60/100 = 79.2 km/h