Question

1 km/hr = $\frac{5}{18}$ cm/s. True/False

• A. True
• B. False

Answer 1

The correct option is B

False

1 km = 1000m

1 m = 100 cm

Therefore, 1000 m = 1000 $\times$ 100 cm = 100000 cm

1 km = 1000 m= 100000 cm ……….(1)

1 hr = 60 minutes

1 minute = 60 seconds

60 minutes = 60 $\times$ 60 seconds

Thus, 60 minutes = 3600 seconds

This means that 1 hr= 60 minutes= 3600 seconds ………(2)

1 km/hr= $\frac{1km}{1hr}=\frac{100000cm}{3600s}$ (From 1 and 2)

$=\frac{1000}{36}cm/s$

$=\frac{1000/4}{36/4}cm/s$

$=\frac{250}{9}cm/s$

Thus, 1 km/hr $=\frac{250}{9}cm/s$

The given statement in the question is thus not true.