Time and Distance - General Aptitude

Q1:

A car travelling with  of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car.

A
17 6 km/hr
7

B 25 km/hr

C 30 km/hr

D 35 km/hr

ANS:D - 35 km/hr

Time taken = 1 hr 40 min 48 sec = 1 hr 40 4 min = 1 51 hrs = 126 hrs.
5 75 75
Let the actual speed be x km/hr.
Then, 5 x x 126 = 42
7 75
 x = 42 x 7 x 75 = 35 km/hr.
5 x 126