A train covers a distance in 50 min, if it runs at a speed of 48kmph on an average. The speed at which the train must run to reduce the time of journey to 20min will be. Select:
A) 60 km/h B) 55 km/h C) 40 km/h D) 120 km/h E) 65 km/h
Time=50/60 hr=5/6hr   Speed=48mph   distance=S*T=48*5/6= 
<gadget id="calculator">48*5/6</gadget>
<output>40</output>
40km   time=20/60hr=1/3hr   New speed = 40* 3/1= 
<gadget id="calculator">40* 3/1</gadget>
<output>120</output>
120kmph   Answer : 120 km/h
<result>D</result>
A train covers a distance in 50 min, if it runs at a speed of 48kmph on an average. The speed at which the train must run to reduce the time of journey to 20min will be.