Time and Distance - Arithmetic Aptitude Questions and Answers

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A car travelling with \( \frac { 5 } { 7 } \)of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car.

17\( \frac { 6} { 7 } \)km/hr

25 km/hr

30 km/hr

35 km/hr

Answer : Option D

Explanation :

Time taken = 1 hr 40 min 48 sec = 1 hr 40\( \frac { 4} { 5 } \)min=1\( \frac {51} { 75 } \)hrs=\( \frac {126} { 75 } \)hrs.

Let the actual speed be x km/hr.

Then,\( \frac { 5} {7 } XX\)\( \frac {126} { 75 } \)=42

x =\( [\frac {42*7*75 } {5*126 } ]\)= 35 km/hr.

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