Question
CIVICS > ELECTION_COMMISSION
1) A train, when it moves at an average speed of 40 kmph, reaches its destination on time, When its average speed becomes 35 kmph, it reaches its destination 15 minutes late. Find the length of the journey
A) 70 kmB) 60 km
C) 80 kmD) None of the above
View Answer        RRB_stenographer_Red_Answer_key_2014
Answer : 70 km

egin{aligned} ext{Timing differences is = 15 min}\ = frac{1}{4} hr\ ext{Length of journey be x km}\ ext{Therfore, }frac{x}{35} - frac{x}{40} = frac{1}{4}\ ext{8x - 7x = 70}\ x = 70 km\ end{aligned}



ranjeet kumar Says on 19/07/2015 07:48:16 pm :

I want to soln


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