With an average speed of 60 km/h, a train reaches its destination on time. If it goes with an average speed of 45 km/h, it is late by 20 minutes. The distance covered by the train is _____.
Answer & explanation
Correct answer: option 4
Let distance = D km
According to question ,
\(\frac{D}{60}\) + \(\frac{20}{60}\) = \(\frac{D}{45}\)
\(\frac{20}{60}\) = \(\frac{D}{45}\) - \(\frac{D}{60}\)
\(\frac{20}{60}\) = \(\frac{4D - 3D}{180}\)
D = 60 km
SO , Distance traveled is 60 km