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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