58
Q:
A) 69.5 km/hr | B) 70 km/hr |
C) 79 km/hr | D) 79.2 km/hr |
Answer: D) 79.2 km/hr
Explanation:
Explanation:
Let the length of the train be x metres and its speed by y m/sec.
Then, x/y = 8 => x = 8y
Now, (x+264)/20 = y
8y + 264 = 20y
y = 22.
Speed = 22 m/sec = (22*18/5) km/hr = 79.2 km/hr.