RRB Group D 17-Dec-2018 Shift 1 Soled Paper

Question : 19 of 100

Marks: +1, -0

Ritesh drove at a speed of 60 km/h for 8 hours. For how many hours should he now drive at a speed of 80 km/h for the overall average speed to become 72 km/h?

Validate

Solution:

Avg speed=

{\Total \distance}/{\Total \time}

72={60×8+80×\T}/{8+\T}

72×8+72×\T=60×8+80×\T

8\T=12×8

T= 12 hour

Go to Question:

Prev Question

Next Question