A train when moves with the speed of 25 kmph it reaches its destination 15 minutes late. While if it runs with the speed of 40 kmph, then it reaches on time. Find the length of journey.

Options
- 20 km
- 16.66 km
- 15 km
- 12 km

CORRECT ANSWER : 16.66 km

Discussion Board
here the Difference of time is 15 min

T1-T2=15min --> should be in min/hour( 15/60)
D/S1-D/S2=15/60
D/25-D/40=15/60 => 40D-25D= 15*25*40/60
D=15*25*40/60*15
Therfore, D=50/3=16.66km

Prachi kakade 07-9-2020 01:30 PM

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