Speed of three train are in ratio 2 : 4 : 5 . Find the ratio of time taken by them .
Answer & explanation
Correct answer: option 1
Speed = \(\frac{Distance}{Time }\)
Ratio of speed and time is inverse to each other .
given ratio T1 : T2 : T3
Speed 2 : 4 : 5
time \(\frac{1}{2 }\) : \(\frac{1}{4 }\) : \(\frac{1}{5 }\)
10 : 5 : 4
so ratio of time = 10 : 5 : 4