A train covers a distance of 100km in 1 hour. If its speed is decreased by 20km/hr, the time taken by the car to cover the same distance will be?
Choose the correct choice from the following:
A) 1hr	B) 1hr 15min	C) 50min	D) 1hr 30min	E) 1hr 45min
Speed = 100/1= 
<gadget id="calculator">100/1</gadget>
<output>100</output>
100km/hr   New speed= 100-20= 
<gadget id="calculator">100-20</gadget>
<output>80</output>
80 km/hr   Time taken= 100/80 = 1hr 15min   Answer is 1hr 15min
<result>B</result>
A train covers a distance of 100km in 1 hour. If its speed is decreased by 20km/hr, the time taken by the car to cover the same distance will be?