Question
CIVICS > ELECTION_COMMISSION
1) An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. To cover the ssm distance in l 2/3 hours, it must travel at a speed of
A) 300 kmphB) 360 kmph
C) 600 kmphD) 720 kmph
View Answer        RRB_JE_2014_Answer-key
Answer : 720 kmph

egin{aligned} ext {Speed S1 = 240 kmph }\
ext {Time T1 = 5 hr }\
ext { Time T2 = } 1 frac{2}{3} hr \
ext {Speed S2} = ? \
ext { Converting to rational } frac {3 + 2 } {3} = frac {5}{3} \
(?) ext {S1 * T1 = S2 * T2} \
ext {T2 = } frac{S1 * T1}{S2} \
ext {Substitute above values in the above equation}\
ext{S2 = } frac{240 * 5 }{frac{5}{3}} \ = frac{240 * 5 * 3}{5}=240 * 3 = 720
end{aligned}




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