SSE JE Electrical Engineering 10 Dec 2020 Papers

Question : 33 of 200

Marks: +1, -0

Train A runs at the speed of 80 km/h and it leaves from station X at 6:00 o'clock. Train B departs from the same station at 6:15 o'clock. At what speed should train B run so as to reach together with Train A on the next station located at a distance of 100 km?

100 km/h
90 km/h
95 km/h
110 km/h

Validate

Solution:

Speed of train A = 80 km/h
Time is taken by train A = t hr
Time is taken by train B = (t -

15/60

) hr
Distance = 100 km
Let Speed of Train B = S km/h
According to question;
Distance covered by train A = Speed × time
100 =80 × t
t =

5/4

hr
Similarly
Distance covered by train B = Speed × time
100 = S × (t -

15/60

)
put t =

5/4

hr
100 = S × (

5/4 - 15/60

)
100 = S × 1
S = 100 km/h
Hence, Speed of train B is 100 km/h.

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