it's the question of quantitative aptitude plz explain
Answers
Answer:
20 minutes
Step-by-step explanation:
distance between Hyderabad and Nalgonda is 100km
Train X starts at 5:30am towards Nalgonda,Train Y starts at 6:00 towards Hyderabad..hence both travel in opposite direction..
Mr Shah realises both are on same track at 6:30am..by the time he realises,Train X travelled for 1hr at 50kmph..hence it travelled 50km from Hyderabad towards Nalgonda,Train Y travelled for half an hour at 40kmph..hence it travelled 20km from Nalgonda towards hyderabad..
[40=distance/(1/2),distance is 20km]
now distance between both trains is 100-(50+20)=30km
This 30km distance is covered by both trains from either end in opposite direction..
relative velocity =50+40=90
total distance between trains is 30km
time taken to meet both trains is
time=distance/relative velocity
time=30/90
time=1/3hr
time=(1/3)×60
time=20minutes
hence Mr Shah has 20minutes time ti avert the accident