Question

two trains 121 m and 165 m in length respectively are running in opposite direction one at a rate of 80 km and other at a rate of 64 kms an hour. at what time do they will completely clear to each other from the moment they meet

Answer 1

Answer:

Step-by-step explanation:

Total distance= 121+165=286km

Total speed= 80+64=144km/hr

144×(5/18)=40m/sec

286/40=7.15sec

Answer 2

The time taken by the train to completely clear each other from the moment they meet each other is 7.15 seconds.

Given:

Two trains are of the length 121 m and 165 m.

Running at opposite direction at 85 km/hr and 64 km/hr.

To find:

Time taken to completely clear each other from the time they meet.

Solution:

Total distance is 121m + 165m = 286m

The Relative speed of the two trains is 80 and 64

= 80 + 64

Relative speed = 144 km/hr

Converting kilometer to meter and hours to seconds $=\frac{14400}{60 \times 60} m/s$

$=\frac{14400}{3600} \frac{m}{s}$

$\Rightarrow 4 \frac{m}{s}$

Time for 2 trains to clear each other,

$=\frac{\text {Distance}}{\text {Speed}}$

$=\frac{286}{4}$

Time = 71.5 seconds