A car travelling with $\frac{5}{7}$ of its usual speed covers 42 km in 1 hour 40 min 48 sec. What is the usual speed of the car

A car travelling with $\frac{5}{7}$ of its usual speed covers 42 km in 1 hour 40 min 48 sec. What is the usual speed of the car
1). $17\frac{6}{7}$ km/hr
2). 35 km/hr
3). 25 km/hr
4). 30 km/hr

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