If a man travels 160 km by car at the speed of 64 km/h and a

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RRB TA Exam (Chennai) 2008 click here to view all questions

If a man travels 160 km by car at the speed of 64 km/h and another 160 km at the speed of 80 km/h, the average speed for the whole journey is

A71.11

B81.11

C91.11

D61.11

Nithin K ? Dec 3 '2016 at 19:26

Answer : 71.11

Explanation:

Formula: 

\(Time = \frac{Distance}{speed} \)

\(\text{total time taken = (times taken for first 160km + times taken for next 160km)}\)
\(\text{total time taken }= \big(\frac{160}{64} + \frac{160}{80}\big)\)

\(=\frac{9}{2}\text{ hours }\)
\(\text{Time taken for 320 Km = 320 }\times \text{29=71.11km/hr}\)

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Answer : 71.11 Explanation: Formula:  \(Time = \frac{Distance}{speed} \) \(\text{total time taken = (times taken for first 160km + times taken for next 160km)}\) \(\text{total time taken }= \big(\frac{160}{64} + \frac{160}{80}\big)\) \(=\frac{9}{2}\text{ hours }\) \(\text{Time taken for 320 Km = 320 }\times \text{29=71.11km/hr}\) Nithin K ? answered Dec 3 '2016 at 19:26 All Comments

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