Question

एक 60 मी० लम्बी रेलगाड़ी जो 42 किमी०/घंटा की रफ्तार से जाती।
है। दूसरी रेलगाड़ी को जो 84 मी० लम्बी है और 30 किमी०/घंटा है
रफ्तार से उसी दिशा में जा रही है, पार करती है। उसे पूरा पार करते हैं
कितना समय लगेगा?
3​

Answer 1

Answer:

43.2 sec

Step-by-step explanation:

Here total distance = 60m + 84m (lenght of both trains)

=> 144 mtr

=> we know very well that both the trains are moving in same direction then the effective speed will be => 42-30 = 12 kmph

(note:- if trains are moving in opposite directions then we add the speed)

=> as distance is in mtr while speed is in km

=> conversation => 12×5/18 (here 5/18 for km to mtr

=> 2/3×5

=> 10/3 ms

as we know that time = distance/speed

so

T = 144/10/3

=> 144×3/10

=> 432/10

=> 43.2 sec