Answer:

Solution

Radius of the wheel =r=260=30 cm

Circumference of the wheel =2πr=2×722×30=71320 cm

Distance covered in 1 revolution =71320 cm

Distance covered in 140 revolutions =71320×140=26400 cm=264 m=1000264 km

Distance covered in one minute = Distance covered in 140 revolutions =1000264 km

Distance covered in 1 hour =1000264×60=15.84 km

Hence, the speed with which the boy is cycling is 15.84km/hr.

Step-by-step explanation:

#study first ^_^