RRB Assistant Loco Pilot and Technician Model Paper 3 with solutions

Question : 23 of 100

Marks: +1, -0

A car covers four successive 6 km stretches at speeds of 25 kmph, 50 kmph, 75 kmph and 150 kmph respectively. Its average speed over this distance is

Solution:

(b) Average Speed =

{\Total \Distance \Covered}/{\Total \Time \Taken}

{ 6 + 6 + 6 + 6 }/ { { 6 } /{ 25 } + { 6 }/ { 50 } + { 6 }/ { 75 } + { 6 }/ { 150 } }

⇒

{ 24 } /{ 6 [ { 1 }/ { 25 } + { 1 }/ { 50 } + { 1 } /{ 75 } + { 1 }/ { 150 } ] }

= { 24 × 300 }/ { 6 × 24 }

⇒ 50 km/hr

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