33.6
Here's how to solve this problem step-by-step:
Step 1: Find the distance covered by auto A.
We know that distance = speed × time. Auto A travels at a speed of 42 km/hr for 2 hours. Therefore, the distance covered by A is:
\(Distance_A = Speed_A \times Time_A = 42 \, km/hr \times 2 \, hr = 84 \, km\)
Step 2: Find the distance covered by auto B.
Auto B covers twice the distance of A, so:
\(Distance_B = 2 \times Distance_A = 2 \times 84 \, km = 168 \, km\)
Step 3: Find the speed of auto B.
Auto B covers 168 km in 5 hours. Using the formula distance = speed × time, we can find the speed of B:
\(Speed_B = \frac{Distance_B}{Time_B} = \frac{168 \, km}{5 \, hr} = 33.6 \, km/hr\)
Therefore, the speed of auto B is 33.6 km/hr.
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Important Questions from Speed Time and Distance
A train travelling at a speed of 72 km/hr crosses a post in 20 seconds. If it crosses another train travelling at a speed of 54 km/hr in the same direction in 1 minute 45 seconds, then the difference in length between the two trains is
Rajiv's boat can travel along the current at the 8 km/hour and against the current at the rate 6 km/hour. Find the time taken by the boat to sail 28 km in still water.
Rohit and Dinesh are 64 km apart. Rohit can walk at a speed of 15 km/hr and Dinesh at the speed of 17 km/hr. In how many hours will they meet if they are travelling towards each other?
Two trains running in opposite directions cross a man standing on the platform in 25 seconds and 32 seconds respectively and they cross each other in 30 seconds. The ratio of their speed is:
A worker covers a distance of 81 km in 11 hours. He travels partly on foot at 4.5 km/h and partly on bicycle at 15 km/h. What is the distance covered on the cycle?
