1.

two trains A and B are moving with speed of 30 km per hour and 40 km per hour respectively and the distance between them is hundred kilometre . after how much time will they meet

Answer»

ANSWER:

time =  \:  \frac{distance}{speed} \\ time =  \frac{100}{30 + 40}  \times  \frac{1}{2} \\ time =  \frac{100}{70} \times   \frac{1}{2}  \\ time =  \frac{50}{70}  \\ time = 0.71 \: hr. \\ time \:  = 42.6 \: min.



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