Question
A car travelling with `5/7` of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car.
Answer: Option D
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Time taken = 1 hr 40 min 48 sec = 1 hr 40`4/5`min = `1 51/75` hrs = `126/75` hrs
Let the actual speed be `x` km/hr.
Then `5/7 x xx 126/75` = 42 or `x = ((42 xx 7 xx 75)/(5 xx 126))` = 35 km/hr.
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