B Nirmala Shastry Solutions for Exercise 1: EXERCISE 10.1

Convert into $\frac{\mathrm{km}}{\mathrm{h}}$

$1200 \frac{\mathrm{cm}}{\mathrm{s}}$
 

Convert into $\frac{\mathrm{km}}{\mathrm{h}}$

$2400 \frac{\mathrm{m}}{\min }$
 

If a boy can walk $5 \mathrm{km}$ in 2 hours, how long will he take to walk
a. $7.5 \mathrm{km}$
b. $0.25 \mathrm{km}$ at this speed?

 A train moves at a speed of $45 \mathrm{km}/\mathrm{h}$. How far (in $\mathrm{km}$) will it go in $4\text{ hours }24$  mins? 

An athlete runs $120 \mathrm{m}$ in $15$seconds, then fill in the blanks in the following table, where $d$ is the distance run in metres in time $t$ seconds.

A man walked the length of a street in $18$ minutes walking at the rate of $6 \mathrm{km}/\mathrm{h}$. Find the length of the street in $\mathrm{km}$.

Madhu starts from his house at $7:45$  am and cycles down to reach his school at $8:15$ am. If the distance from his house to school is $7.5 \mathrm{km}$, calculate his speed in $\mathrm{km}/\mathrm{h}$.

Amar ran a marathon of $21 \mathrm{km}$ in $3\frac{1}{2}$ hours. Find his speed in $\mathrm{km}/\mathrm{h}$.