1.

On a track of 100 km a train travels the furst 30 km at a speed of 30km/h. how fast must train travel the next 70km so that the average speed of train for entire trip becomes 40km/h

Answer»

Average speed is 40kmph and total distance is 100km
so time taken is 100/40=2.5 hr
distance COVERED in 1st hris 30km
REMAINING 70KM should be COVERD in1.5 hr
so speed is 70/1.5=700/15=160/3=53.3kmph



Discussion

No Comment Found

Related InterviewSolutions