CTET Class I to V 2013 Jul Paper

Question : 34 of 150

Marks: +1, -0

The speed of a boat in a river is 20 km per hour and the speed of another boat is 23 km per hour. They travel in the same direction from the same place at the same time. The distance between the boats after three and half hours is

10 km
10.5 km
11 km
11.5 km

Validate

Solution:

Distance travelled by first boat

=

Speed

\times

time

=20 × 3 \;{1}/{2}=20 × \;{7}/{2}=70 {km}

Distance travelled by second boat

=23 × 3 \;{1}/{2}=23 × \;{7}/{2}=80.5 {km}

Distance between the boats

=80.5-70=10.5 {km}

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