Answer: Raju travels at a higher speed.
Step-by-step explanation:

Speed inversely proportional to time.
As time taken to cover a particular distance decreases the speed will increase.
Raju covers a certain distance in 1 hour.
Sham covers the same distance in 2 hours.
1< 2
Thus Raju travels at a higher speed.
Answer: R=8
Step-by-step explanation: R-7=1, R+7=1+7, R=8.
Use an online math calculator for more accurate answers just plug in the variables