Train travelling at 90km/hr crosses goods train at 50km/hr in opposite direction completely in 50 sec.How long it takes train to overtake same goods train,if travellling in same direction?
Answers
Ans:-1.25m/s*s
Explanation:
U=90km/hr=25m/s
V=50km/hr=13.8m/s
Time=50s
Acceleration=v-u/t
Il =25-13m/s/50s
Il. =0.224m/s*s
Answer:
The correct answer is 175 seconds.
Explanation:
This can be solved by taking into consideration the relative speed.
Let the total distance to be covered be the sum of the length of both the trains
So, Distance = Speed* Time ( Relative speed= 90+50 = 140 km/hr)
Converting it to m/s = 140 *(5/18) = 38.89 m/s
Now, finding the total length= 38.89 *50 = 1944.5 m
Hence, the time required to overtake the goods train when travelling in the same direction = Distance/Relative Speed
Since the direction is same the relative speed will be the subtraction of both the speeds.
Relative speed = 90-50= 40 km/hr
Changing into m/s = 40*5/18 = 11.11 m/s
Time = 1944.5 /11.11 = 175 seconds.