A train covers a distance of 20 km in 10 minutes. If its speed is decreased by 10 km/hr, the time taken by it to cover the same distance will be?
Choose the correct choice from the following choices:
A) 20min 15sec  B) 11min 30sec  C) 15min 20sec  D) 12min 10sec  E) 9min 30sec
Speed = 20*60/10= 
<gadget id="calculator">20*60/10</gadget>
<output>120</output>
120 km/hr   new speed= 120-10= 
<gadget id="calculator">120-10</gadget>
<output>110</output>
110 km/hr   time taken= 20/110 = 60*2/11 = 11 min 30 sec   Answer is 11min 30sec
<result>B</result>
A train covers a distance of 20 km in 10 minutes. If its speed is decreased by 10 km/hr, the time taken by it to cover the same distance will be?