Kiran rides her scooter 14km at an average speed of 16 km/hr and again travels 16km at an average sp

M4maths Previous Puzzles

03 Nov 2020 TIME, SPEED AND DISTANCE

Kiran rides her scooter 14km at an average speed of 16 km/hr and again travels 16km at an average speed of 14 km/hr. What is her average speed for the entire trip approximately?

OPtion

1) 15.36 km/hr
2) 17.46 km/hr
3) 13.56 km/hr
4) 14.26 km/hr
5) 14.33 km/hr
6) 13.98 km/hr
7) 14.86 km/hr
8) 16.55 km/hr
9) 16.42 km/hr

Solution

Total distance travelled =14+16=30Km
Time taken to travel 14 km at an average speed of 16 km/hr =14/16=7/8 Hr
Time taken to travel 16 km at an average speed of 14 km/hr =16/14=8/7 hr
Total time taken =7/8+8/7 Average speed =Total distance travelled /Total time taken =30/(7/8+8/7) =30/(113/56)
=30*56/113=1680/113
=14.86 km/hr

Correct Option: 7 Best Solution (3)

Raghvi Gupta   4 years AGO

Average speed= total distance/total time taken

Like? Yes (2) | No   

SAYAN CHATTERJEE   4 years AGO

avg speed= (14+16)/(14/16+16/14)
= 14.86 kmph
Option 7.

Like? Yes | No   

Rohit gupta   4 years AGO

T1 = D/S = 14 / 16=0.875 hr
T2 = D/S = 16 / 14=1.142 hr
Average speed =30 / 2.0178 = 14 .86 km/hr

Like? Yes | No