For the following questions answer them individually
Tribeni bad to travel 175 km in 3.5 hours. However, she travelled at the rate of 58 km/hr for 2.5 hours and then rested for 20 minutes before completing the journey. If Tribeni managed to reach on time, her speed during the last stretch would have been ..........?
An object travels 24 m in 3 s and then another 15 m in 2 s. What is the average speed of the object?
$$(- 12)[11 + \left\{ 7 \times (- 3)\right\} ] \div [4 \left\{ 13 - (- 3) \times (- 6)\right\}] =$$