How many minutes will Radha take to cover a distance of 1950 m, if she runs at a speed of 26 km/h?

Options
a) $ 7 \frac 12 $ minutes
b) $ 4 \frac 12 $ minutes
c) $ 3 \frac 12 $ minutes
d) $ 5 \frac 12 $ minutes

Solution

As per question
D = 1950 m
S = 26 km/h
T = ?
T = $ \frac DS $
26 km/h = $ 26 \times \frac{1000}{60}= \frac{2300}{60} = \frac{1300}{3}$ m/min.
T = $ \frac DS $
T = $ 1950 \div \frac {1300}{3}$
T = $ 1950 \times \frac {3}{1300}$
T = $ \frac {5850}{1300} $
T = $ \frac {9}{2} $
T = $ 4 \frac 12 $ min.

Answer: $ 4 \frac 12 $ min.