Question

Directions (Q 16 to 19): Aishwarya is going to cover a distance of 380 krn from Ambala to Knandala.The first one-third of the distance she covers on a cycle. The second one-third she covers by an auto rickshaw and the remaining distance she travels by car. The average speed of the journey by a car is 5 times the average speed by cycle and 20 kmh more than the average speed by auto-rickshaw, but she took 1 hour more by auto-rickshaw than by car.

16.What is the average speed of the whole journey?
(A) 15 km/h
(B) 24 km/h
(C) 20 km/h
(D) none of these

17.What is the time taken in the whole journey!
(A) 10 h
(B) 12 h
(C) 15 h
(D) none of these

18.What is the distance covered by her in last five hours of her journey?
(A) 250 km
(B) 240 km
(C) 200 km
(D) can't be determined

19.lnstead of traveling the first one-third by cycle if she travels by same auto-rickshaw with the same
average speed, then what is the percentage decrease increase in time taken during the entire
journey?
(A) 46.66%
(B) 33.33%
(C) 50%
(D) 25%​

Answer 1

Step-by-step explanation: first take average speed by cycle=x

then average speed by car=5x

and average speed by auto= 5x-20

then avarage speed = total distance by total time

will be x+5x-20+5x=380/total time