A train is walking at 6/7 of its usual speed, the train is 20 minutes too late. Find its usual time to cover the journey.	Options:
A) 1 hour
B) 30min
C) 3 hours 20 min
D) 2 hours 30 min
E) 2 hours
new speed = 6/7 of the usual speed   new time taken = 7/6 of the usual time taken   so, ( 7/6 of the usual time ) - ( usual time ) = 20min   1/6 of the usual time = 20min   usual time = 20*6= 
<gadget id="calculator">20*6</gadget>
<output>120</output>
120 min= 2 hours   correct option is 2 hours
<result>E</result>
A train is walking at 6/7 of its usual speed, the train is 20 minutes too late. Find its usual time to cover the journey.