Question

. When
A train when moves at an average speed of 40kmph reaches its destination on
average speed becomes 35 kmph, then it reaches its destination 15 minutes then
length of journey.
a) 30 km
b) 40 km
c) 70 km
d) 80 km
​

Answer 1

Answer:

hey ur answer

Step-by-step explanation:

let the distance be D

time T1 ,when speed is 40km/hr = D/40

time T2 , when speed is 35km/hr = D/35

according to the question,

D/35-D/40=15/60

by cross multiplying,

40D-35D/1400=15/60

5D/1400=15/60

5D=1400*15/60

Therefore, D=70 km

ur option is (c)

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