Question

6. A rectangular field is 72 m by 58 m. Amar walks
m m
round it at the rate of 3 km per hour. What time
will he take in taking 2 rounds.​

Answer 1

Answer:

Dimension of rectangular field =72cm

by 58

Perimeter of rectangular field =2(l+b)

=2×(72+58)

=2×130=260m

The distance took by Amar in taking two rounds =2×260m

=520m

Speed of Amar=3 km/hr

=

3000

3×1000

m/sec =

6

5

m/s

Total times taken =

Speed

Distance

=

6

5

520

=520×

5

6

=104×

60

6

min =10.4min.

Answer 2

Answer:

Dimension of rectangular field =72cm

by 58

Perimeter of rectangular field =2(l+b)

=2×(72+58)

=2×130=260m

The distance took by Amar in taking two rounds =2×260m

=520m

Speed of Amar=3 km/hr

= (3×1000)/3000 m/sec

= 5/6m/sec

Total times taken = Distance/Speed

= 520/(5/6)

=520×(6/5)

=104× (6/60) min

=10.4min