Chapter 5
5.62
ASSESS YOUR LEARNING
163.
(d):
Average speed
=
2
×
30
×
[60/(30+60)]
=
2
×
30
×
(60/90)
=
40 mph
Time taken by train to complete the trip
=
Distance/
Speed
=
20
40
=
½ hour
=
30 minutes
164.
(a):
The distance covered by auto rickshaw
=
1
−
[(1/2)+(1/3)]
=
1
6
1
6
of total journey
=
5 km
Total journey
=
6
×
5
=
30 km
165.
(b):
Due to stoppages, it covers 9 km less.
Time taken to cover 9 km
=
(9/54)
×
60 minutes
=
10 minutes
166.
(b):
Average speed
=
(
)
(
)
2
21
24
21
24
×
×
+
=
22.4 kmph
Distance
=
Time
×
Speed
=
22.4
×
10
=
224 km
167. ...
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