A train covers a distance of 100km in 1 hour. If its speed is decreased by 15km/hr, the time taken by the car to cover the same distance will be? Choose the correct choice from the following options.
A) 1hr
B) 1hr 10min
C) 50min
D) 1hr 30min
E) 1hr 45min
Speed = 100/1= 
<gadget id="calculator">100/1</gadget>
<output>100</output>
100km/hr   New speed= 100-15= 
<gadget id="calculator">100-15</gadget>
<output>85</output>
85 km/hr   Time taken= 100/85 = 1hr 10min   Answer is 1hr 10min
<result>B</result>
A train covers a distance of 100km in 1 hour. If its speed is decreased by 15km/hr, the time taken by the car to cover the same distance will be?