Average Practice Test 3

Let the total distance covered during journey = 60 km

1

3

of the distance covered during journey =60×

1

3

= 20 km

1

4

of the distance covered during journey =

1

4

×60 = 15 km
∴ The distance covered during the rest of journey = 60 – (20 + 15) = 25 km
Time taken to cover 20 km at 25 km/h =

20

25

hours =

4

5

hour
Time taken to cover 15 km at 30 km/h =

15

30

hours =

1

2

hour
Time taken to cover 25 km at 50 km/h =

25

50

hours =

1

2

hour
Total time taken =

4

5

+

1

2

+

1

2

=

9

5

hours
Hence average speed per hour =

60÷9

5

=60×

5

9

=

100

3

km / h
= 33

1

3

km