RRB NTPC 28 April 2016 Paper

Question : 99 of 100

Marks: +1, -0

Arjun, travelling from Pune to Goa, covers a distance of 1000 km at 4 km/hr and the return journey at 3 km/hr. What was his average speed during his entire journey’?

3 km/hr
3.43 km/hr
3.5 km/hr
5.4 km/hr

Validate

Solution:

(2) S = 4 Km/hr
D = 1000 km
T =

D / S

1000/4

= 250 hours
While returning,
S = 3 km/hr
D = 1000 km
T =

D / S

1000/3

hours
Average speed

= { { \text "Total Distance" } }/{ { \text "Total Time" } }

= { 1000 + 1000 }/ { 250 + { 1000 } /{ 3 } } = { 2000 }/ { 1750 / 3 }

= { 6000 }/ { 1750 } = { 24 }/ { 7 } = 3.4 { km } / { hr }

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