A train 140 m long traveling at 60 km/hr overtakes another train travelling in the same direction at 42km /hr and passes it completely in 50x . find time they will take to cross each other of they travel in opponent directio
Answers
Step-by-step explanation:
7A train 140 m long traveling at 60 km/hr overtakes another train travelling in the same direction at 42km /hr and passes it completely in 50x . find time they will take to cross each other of they travel in opponent directio
Answer:
Length of trains = 140m, 72m
Time taken to overtake = 13.25 sec
Speed of 2nd train = 56 km/h
CONCEPT:
When two objects are moving in the same direction the relative speed is the difference of individual speeds.
Distance traveled by a train to overtake another train is equal to the sum of their lengths.
FORMULA USED:
Speed = Distance/time
CALCULATION:
Let the speed of the train be x km/h.
Total distance = 140 + 72 = 212 m
Relative speed = 212/13.25 = 16 m/s
⇒ 16 × 18/5 = 57.6 km/h
∴ x - 56 = 57.6
x = 113.6 km/h
∴ Speed is 113.6 km/h