Question

An express Kadamba bus takes 1 hour less
than an ordinary bus to travel a distance of
180 km. from Karwar to Sawantwadi. If the
average speed of the express Kadamba
bus is 15 km/hr. more than that of the
ordinary bus. Find the average speed of
the ordinary bus.
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Answer 1

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Solution :

Distance travelled by bus in 30 minutes =40 km

Distance travelled in 3 hrs =4030=x180

=> x=40×18030

x=240km

Answer : 240km

Answer 2

Let, the time taken by ordinary buses be,'x'hours

The time taken by Kadamba = (x-1) hours

By condition,

15(x-1) = 180

or, (x-1) = 180/15

or, x = 13+1

or, x = 14

So, the time taken by other buses is 14 hours

So, the speed of other buses = (180/14) km/hr

                                                 = 11+(6/14) km/hr

                                                 = 11+(3/7) km/hr

(Ans): 11 whole of 3/7 km/hr.