A train 800 metres long is running at a speed of 78 km/hr. If it cros…

Question

A train 800 metres long is running at a speed of 78 km/hr. If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is:

Accepted Answer

Option C. 500. Answer & Solution Answer: Option C Solution: & Speed = ( 78 × 518 )\, m/sec & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 653 \, m/sec & Time = \, 1\, minute = 60\, second. & Let\, the\, length\, of\, the\, tunnel\, be\,x\, metres. & Then,\, 800 + x60 = 653 & 3 ( 800 + x ) = 3900…