A bus is going with 5/7 of its real speed covers 42 km in 1 hr 40 min 48 sec. What is the actual speed of bus ?

A) 19 hours

B) 17 hours

C) 35.5 hours

D) 35 hours

So first convert the time in hours.

1 hours 40 min 48 sec = 1 hours 40 min (48/60) min

= 1 hours (40/60)hours (4/(5 * 60)) hours

= 126/75 hours

Assume that the real speed of bus is x km/hr.

so (x * (5/7)) * 126/75 = 42.

x = (42 * 7 * 75)/(5 * 126) hours

x= 35 hours

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