Question
1/3 rd of certain journey is covered at the rate of 25 km/hr, 1/4 th at the rate of 30 km/hr and rest at 50 km/hr. Find the averae speed for the whole journey?
Answer: Option B
- Let the journey by a km. Then a/3 km at the speed of 25 km/hr and a/4 km at 30 km/hr and the rest distance ( a- a/3 –a/4 ) = 5/12 x a at the speed of 50 km/hr.
Total time taken during the journey of a km
a + a + 5a = 18a = 3a 3 x 25 4 x 30 12 x 50 600 100
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- Let the journey by a km. Then a/3 km at the speed of 25 km/hr and a/4 km at 30 km/hr and the rest distance ( a- a/3 –a/4 ) = 5/12 x a at the speed of 50 km/hr.
Total time taken during the journey of a km
a + a + 5a = 18a = 3a 3 x 25 4 x 30 12 x 50 600 100
Was this answer helpful ?
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